Error: Aesthetics must be either length 1 or the same as the data (1157): x

I'm getting multiple errors and I'm hoping someone can help, even if it's just one thing. It's like I try to do it one way, and I get an error and I try to fix it, and I get a different error, and then I think I fixed it, and then the next line has another error and it's just really frustrating.

Here's my reprex:

library(tidyverse)
pitching_data <- read.csv("Pitching.csv")
#> Warning in file(file, "rt"): cannot open file 'Pitching.csv': No such file or
#> directory
#> Error in file(file, "rt"): cannot open the connection
pitching_data$yearID <- as.factor(pitching_data$yearID)
#> Error in is.factor(x): object 'pitching_data' not found
ggplot(pitching_data)+ 
  geom_boxplot(aes(x=yearID, y=ERA))
#> Error in ggplot(pitching_data): object 'pitching_data' not found
pitching_data <- summarize(group_by(pitching_data, ERA),
                           median=median(ERA,na.rm=T)) 
#> Error in group_by(pitching_data, ERA): object 'pitching_data' not found
pitch_year <- pitching_data$yearID
#> Error in eval(expr, envir, enclos): object 'pitching_data' not found
ggplot(pitching_data)+
  geom_line(aes(x=pitch_year, y=median))
#> Error in ggplot(pitching_data): object 'pitching_data' not found

Created on 2021-11-30 by the reprex package (v2.0.1)

when I run

  geom_boxplot(aes(x=yearID, y=ERA))

I get this

Warning message:
Removed 90 rows containing non-finite values (stat_boxplot).

so the plot shows up, but I would like the error message to go away and I'm not sure how to fix that.

Then when I run

  geom_line(aes(x=pitch_year, y=median))

and it tells me

Error: Aesthetics must be either length 1 or the same as the data (1157): x

Here's a screenshot of my pitching_data. I included

pitch_year <- pitching_data$yearID 

in my code because sometimes it gave me the error that yearID was not a valid column, even though it's on there.

Here's the code for my

dput(pitching_data)
structure(list(ERA = c(0, 0.38, 0.39, 0.4, 0.43, 0.44, 0.45, 
0.49, 0.5, 0.51, 0.53, 0.54, 0.55, 0.56, 0.57, 0.59, 0.6, 0.61, 
0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 
0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.81, 0.82, 0.83, 0.84, 
0.86, 0.87, 0.88, 0.89, 0.9, 0.92, 0.93, 0.94, 0.95, 0.96, 0.98, 
1, 1.01, 1.02, 1.03, 1.04, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 
1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 
1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 
1.34, 1.35, 1.36, 1.37, 1.38, 1.39, 1.4, 1.41, 1.42, 1.43, 1.44, 
1.45, 1.46, 1.47, 1.48, 1.49, 1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 
1.56, 1.57, 1.58, 1.59, 1.6, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 
1.67, 1.68, 1.69, 1.7, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 
1.78, 1.79, 1.8, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 
1.89, 1.9, 1.91, 1.92, 1.93, 1.94, 1.95, 1.96, 1.97, 1.98, 1.99, 
2, 2.01, 2.02, 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 2.09, 2.1, 
2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.2, 2.21, 
2.22, 2.23, 2.24, 2.25, 2.26, 2.27, 2.28, 2.29, 2.3, 2.31, 2.32, 
2.33, 2.34, 2.35, 2.36, 2.37, 2.38, 2.39, 2.4, 2.41, 2.42, 2.43, 
2.44, 2.45, 2.46, 2.47, 2.48, 2.49, 2.5, 2.51, 2.52, 2.53, 2.54, 
2.55, 2.56, 2.57, 2.58, 2.59, 2.6, 2.61, 2.62, 2.63, 2.64, 2.65, 
2.66, 2.67, 2.68, 2.69, 2.7, 2.71, 2.72, 2.73, 2.74, 2.75, 2.76, 
2.77, 2.78, 2.79, 2.8, 2.81, 2.82, 2.83, 2.84, 2.85, 2.86, 2.87, 
2.88, 2.89, 2.9, 2.91, 2.92, 2.93, 2.94, 2.95, 2.96, 2.97, 2.98, 
2.99, 3, 3.01, 3.02, 3.03, 3.04, 3.05, 3.06, 3.07, 3.08, 3.09, 
3.1, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.2, 
3.21, 3.22, 3.23, 3.24, 3.25, 3.26, 3.27, 3.28, 3.29, 3.3, 3.31, 
3.32, 3.33, 3.34, 3.35, 3.36, 3.37, 3.38, 3.39, 3.4, 3.41, 3.42, 
3.43, 3.44, 3.45, 3.46, 3.47, 3.48, 3.49, 3.5, 3.51, 3.52, 3.53, 
3.54, 3.55, 3.56, 3.57, 3.58, 3.59, 3.6, 3.61, 3.62, 3.63, 3.64, 
3.65, 3.66, 3.67, 3.68, 3.69, 3.7, 3.71, 3.72, 3.73, 3.74, 3.75, 
3.76, 3.77, 3.78, 3.79, 3.8, 3.81, 3.82, 3.83, 3.84, 3.85, 3.86, 
3.87, 3.88, 3.89, 3.9, 3.91, 3.92, 3.93, 3.94, 3.95, 3.96, 3.97, 
3.98, 3.99, 4, 4.01, 4.02, 4.03, 4.04, 4.05, 4.06, 4.07, 4.08, 
4.09, 4.1, 4.11, 4.12, 4.13, 4.14, 4.15, 4.16, 4.17, 4.18, 4.19, 
4.2, 4.21, 4.22, 4.23, 4.24, 4.25, 4.26, 4.27, 4.28, 4.29, 4.3, 
4.31, 4.32, 4.33, 4.34, 4.35, 4.36, 4.37, 4.38, 4.39, 4.4, 4.41, 
4.42, 4.43, 4.44, 4.45, 4.46, 4.47, 4.48, 4.49, 4.5, 4.51, 4.52, 
4.53, 4.54, 4.55, 4.56, 4.57, 4.58, 4.59, 4.6, 4.61, 4.62, 4.63, 
4.64, 4.65, 4.66, 4.67, 4.68, 4.69, 4.7, 4.71, 4.72, 4.73, 4.74, 
4.75, 4.76, 4.77, 4.78, 4.79, 4.8, 4.81, 4.82, 4.83, 4.84, 4.85, 
4.86, 4.87, 4.88, 4.89, 4.9, 4.91, 4.92, 4.93, 4.94, 4.95, 4.96, 
4.97, 4.98, 4.99, 5, 5.01, 5.02, 5.03, 5.04, 5.05, 5.06, 5.07, 
5.08, 5.09, 5.1, 5.11, 5.12, 5.13, 5.14, 5.15, 5.16, 5.17, 5.18, 
5.19, 5.2, 5.21, 5.22, 5.23, 5.24, 5.25, 5.26, 5.27, 5.28, 5.29, 
5.3, 5.31, 5.32, 5.33, 5.34, 5.35, 5.36, 5.37, 5.38, 5.39, 5.4, 
5.41, 5.42, 5.43, 5.44, 5.45, 5.46, 5.47, 5.48, 5.49, 5.5, 5.51, 
5.52, 5.53, 5.54, 5.55, 5.56, 5.57, 5.58, 5.59, 5.6, 5.61, 5.62, 
5.63, 5.64, 5.65, 5.66, 5.67, 5.68, 5.69, 5.7, 5.71, 5.72, 5.73, 
5.74, 5.75, 5.76, 5.77, 5.78, 5.79, 5.8, 5.81, 5.82, 5.83, 5.84, 
5.85, 5.86, 5.87, 5.88, 5.89, 5.9, 5.91, 5.92, 5.93, 5.94, 5.95, 
5.96, 5.97, 5.98, 5.99, 6, 6.01, 6.02, 6.03, 6.04, 6.05, 6.06, 
6.07, 6.08, 6.09, 6.1, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16, 6.17, 
6.18, 6.19, 6.2, 6.21, 6.22, 6.23, 6.24, 6.25, 6.26, 6.27, 6.28, 
6.29, 6.3, 6.31, 6.32, 6.33, 6.34, 6.35, 6.36, 6.37, 6.38, 6.39, 
6.4, 6.41, 6.42, 6.43, 6.44, 6.45, 6.46, 6.47, 6.48, 6.49, 6.5, 
6.51, 6.52, 6.53, 6.54, 6.55, 6.56, 6.57, 6.58, 6.59, 6.6, 6.61, 
6.62, 6.63, 6.64, 6.65, 6.66, 6.67, 6.68, 6.69, 6.7, 6.71, 6.72, 
6.73, 6.75, 6.77, 6.78, 6.79, 6.8, 6.81, 6.82, 6.83, 6.84, 6.85, 
6.86, 6.87, 6.88, 6.89, 6.9, 6.91, 6.92, 6.93, 6.94, 6.95, 6.96, 
6.97, 6.98, 6.99, 7, 7.01, 7.02, 7.03, 7.04, 7.05, 7.06, 7.07, 
7.08, 7.09, 7.1, 7.11, 7.12, 7.13, 7.14, 7.15, 7.16, 7.17, 7.18, 
7.19, 7.2, 7.21, 7.22, 7.23, 7.24, 7.25, 7.26, 7.27, 7.28, 7.29, 
7.3, 7.31, 7.32, 7.33, 7.34, 7.35, 7.36, 7.37, 7.38, 7.39, 7.4, 
7.41, 7.42, 7.43, 7.44, 7.45, 7.46, 7.47, 7.48, 7.49, 7.5, 7.51, 
7.52, 7.53, 7.54, 7.55, 7.56, 7.57, 7.58, 7.59, 7.6, 7.61, 7.62, 
7.63, 7.64, 7.65, 7.66, 7.67, 7.68, 7.69, 7.7, 7.71, 7.74, 7.76, 
7.77, 7.78, 7.79, 7.8, 7.81, 7.82, 7.83, 7.84, 7.85, 7.86, 7.87, 
7.88, 7.89, 7.9, 7.91, 7.92, 7.93, 7.94, 7.96, 7.97, 7.98, 7.99, 
8, 8.02, 8.03, 8.04, 8.05, 8.06, 8.07, 8.08, 8.1, 8.11, 8.13, 
8.14, 8.15, 8.16, 8.17, 8.18, 8.19, 8.2, 8.21, 8.22, 8.24, 8.25, 
8.26, 8.27, 8.28, 8.29, 8.31, 8.32, 8.33, 8.34, 8.35, 8.36, 8.37, 
8.38, 8.39, 8.4, 8.41, 8.42, 8.44, 8.45, 8.46, 8.47, 8.48, 8.49, 
8.5, 8.51, 8.52, 8.53, 8.54, 8.55, 8.56, 8.57, 8.58, 8.59, 8.6, 
8.61, 8.62, 8.63, 8.64, 8.65, 8.66, 8.67, 8.68, 8.69, 8.7, 8.71, 
8.74, 8.75, 8.76, 8.77, 8.78, 8.79, 8.8, 8.81, 8.82, 8.83, 8.84, 
8.85, 8.86, 8.87, 8.88, 8.89, 8.9, 8.91, 8.95, 9, 9.08, 9.09, 
9.1, 9.12, 9.13, 9.14, 9.15, 9.16, 9.17, 9.18, 9.19, 9.2, 9.22, 
9.23, 9.24, 9.25, 9.26, 9.27, 9.28, 9.3, 9.31, 9.32, 9.33, 9.35, 
9.36, 9.37, 9.38, 9.39, 9.41, 9.42, 9.43, 9.44, 9.45, 9.49, 9.53, 
9.55, 9.56, 9.57, 9.58, 9.6, 9.61, 9.62, 9.64, 9.66, 9.67, 9.68, 
9.69, 9.71, 9.72, 9.74, 9.75, 9.76, 9.78, 9.79, 9.8, 9.82, 9.85, 
9.86, 9.87, 9.88, 9.89, 9.9, 9.92, 9.95, 9.96, 9.98, 9.99, 10, 
10.01, 10.02, 10.03, 10.04, 10.05, 10.06, 10.07, 10.13, 10.15, 
10.16, 10.18, 10.19, 10.2, 10.21, 10.22, 10.23, 10.24, 10.26, 
10.27, 10.29, 10.3, 10.31, 10.32, 10.34, 10.35, 10.38, 10.43, 
10.45, 10.46, 10.47, 10.48, 10.5, 10.54, 10.55, 10.57, 10.61, 
10.62, 10.64, 10.66, 10.67, 10.69, 10.7, 10.71, 10.8, 10.89, 
10.9, 10.91, 10.93, 10.94, 10.95, 10.96, 10.97, 11, 11.02, 11.05, 
11.07, 11.08, 11.09, 11.1, 11.12, 11.15, 11.17, 11.2, 11.25, 
11.28, 11.29, 11.3, 11.31, 11.32, 11.33, 11.34, 11.35, 11.37, 
11.39, 11.4, 11.42, 11.45, 11.48, 11.49, 11.5, 11.57, 11.63, 
11.66, 11.68, 11.69, 11.7, 11.74, 11.77, 11.81, 11.84, 11.85, 
11.88, 11.91, 11.93, 11.94, 11.96, 12, 12.05, 12.06, 12.08, 12.1, 
12.15, 12.19, 12.21, 12.27, 12.34, 12.38, 12.41, 12.42, 12.46, 
12.52, 12.54, 12.55, 12.56, 12.6, 12.66, 12.67, 12.71, 12.75, 
12.79, 12.83, 12.86, 12.89, 12.91, 12.94, 12.96, 13, 13.03, 13.04, 
13.06, 13.09, 13.14, 13.15, 13.27, 13.33, 13.5, 13.75, 13.79, 
13.85, 13.86, 13.89, 13.91, 13.97, 14, 14.04, 14.09, 14.14, 14.21, 
14.25, 14.29, 14.32, 14.34, 14.4, 14.46, 14.54, 14.58, 14.59, 
14.63, 14.73, 14.85, 15, 15.09, 15.1, 15.19, 15.26, 15.43, 15.58, 
15.63, 15.71, 15.75, 15.83, 15.88, 16, 16.03, 16.2, 16.36, 16.43, 
16.5, 16.62, 16.71, 16.76, 16.88, 17, 17.05, 17.18, 17.25, 17.28, 
17.36, 17.47, 17.55, 17.61, 17.69, 18, 18.36, 18.41, 18.56, 18.69, 
18.9, 19, 19.06, 19.29, 19.64, 19.76, 19.8, 20, 20.25, 20.57, 
20.77, 21, 21.13, 21.21, 21.6, 21.94, 22.09, 22.24, 22.5, 22.74, 
22.85, 23.14, 23.4, 23.63, 24, 24.3, 24.43, 24.75, 24.92, 25.07, 
27, 28.42, 29.7, 30.38, 30.86, 31.5, 32.4, 33.75, 36, 37.13, 
37.8, 38.57, 40.5, 42.43, 43.2, 43.88, 45, 47.25, 48.6, 49.5, 
54, 60, 63, 67.5, 81, 90, 94.5, 108, 135, 162, 189, NA), median = c(0, 
0.38, 0.39, 0.4, 0.43, 0.44, 0.45, 0.49, 0.5, 0.51, 0.53, 0.54, 
0.55, 0.56, 0.57, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 
0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 
0.78, 0.79, 0.81, 0.82, 0.83, 0.84, 0.86, 0.87, 0.88, 0.89, 0.9, 
0.92, 0.93, 0.94, 0.95, 0.96, 0.98, 1, 1.01, 1.02, 1.03, 1.04, 
1.06, 1.07, 1.08, 1.09, 1.1, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 
1.17, 1.18, 1.19, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 
1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 
1.39, 1.4, 1.41, 1.42, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, 
1.5, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.6, 
1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.7, 1.71, 
1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.8, 1.81, 1.82, 
1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.9, 1.91, 1.92, 1.93, 
1.94, 1.95, 1.96, 1.97, 1.98, 1.99, 2, 2.01, 2.02, 2.03, 2.04, 
2.05, 2.06, 2.07, 2.08, 2.09, 2.1, 2.11, 2.12, 2.13, 2.14, 2.15, 
2.16, 2.17, 2.18, 2.19, 2.2, 2.21, 2.22, 2.23, 2.24, 2.25, 2.26, 
2.27, 2.28, 2.29, 2.3, 2.31, 2.32, 2.33, 2.34, 2.35, 2.36, 2.37, 
2.38, 2.39, 2.4, 2.41, 2.42, 2.43, 2.44, 2.45, 2.46, 2.47, 2.48, 
2.49, 2.5, 2.51, 2.52, 2.53, 2.54, 2.55, 2.56, 2.57, 2.58, 2.59, 
2.6, 2.61, 2.62, 2.63, 2.64, 2.65, 2.66, 2.67, 2.68, 2.69, 2.7, 
2.71, 2.72, 2.73, 2.74, 2.75, 2.76, 2.77, 2.78, 2.79, 2.8, 2.81, 
2.82, 2.83, 2.84, 2.85, 2.86, 2.87, 2.88, 2.89, 2.9, 2.91, 2.92, 
2.93, 2.94, 2.95, 2.96, 2.97, 2.98, 2.99, 3, 3.01, 3.02, 3.03, 
3.04, 3.05, 3.06, 3.07, 3.08, 3.09, 3.1, 3.11, 3.12, 3.13, 3.14, 
3.15, 3.16, 3.17, 3.18, 3.19, 3.2, 3.21, 3.22, 3.23, 3.24, 3.25, 
3.26, 3.27, 3.28, 3.29, 3.3, 3.31, 3.32, 3.33, 3.34, 3.35, 3.36, 
3.37, 3.38, 3.39, 3.4, 3.41, 3.42, 3.43, 3.44, 3.45, 3.46, 3.47, 
3.48, 3.49, 3.5, 3.51, 3.52, 3.53, 3.54, 3.55, 3.56, 3.57, 3.58, 
3.59, 3.6, 3.61, 3.62, 3.63, 3.64, 3.65, 3.66, 3.67, 3.68, 3.69, 
3.7, 3.71, 3.72, 3.73, 3.74, 3.75, 3.76, 3.77, 3.78, 3.79, 3.8, 
3.81, 3.82, 3.83, 3.84, 3.85, 3.86, 3.87, 3.88, 3.89, 3.9, 3.91, 
3.92, 3.93, 3.94, 3.95, 3.96, 3.97, 3.98, 3.99, 4, 4.01, 4.02, 
4.03, 4.04, 4.05, 4.06, 4.07, 4.08, 4.09, 4.1, 4.11, 4.12, 4.13, 
4.14, 4.15, 4.16, 4.17, 4.18, 4.19, 4.2, 4.21, 4.22, 4.23, 4.24, 
4.25, 4.26, 4.27, 4.28, 4.29, 4.3, 4.31, 4.32, 4.33, 4.34, 4.35, 
4.36, 4.37, 4.38, 4.39, 4.4, 4.41, 4.42, 4.43, 4.44, 4.45, 4.46, 
4.47, 4.48, 4.49, 4.5, 4.51, 4.52, 4.53, 4.54, 4.55, 4.56, 4.57, 
4.58, 4.59, 4.6, 4.61, 4.62, 4.63, 4.64, 4.65, 4.66, 4.67, 4.68, 
4.69, 4.7, 4.71, 4.72, 4.73, 4.74, 4.75, 4.76, 4.77, 4.78, 4.79, 
4.8, 4.81, 4.82, 4.83, 4.84, 4.85, 4.86, 4.87, 4.88, 4.89, 4.9, 
4.91, 4.92, 4.93, 4.94, 4.95, 4.96, 4.97, 4.98, 4.99, 5, 5.01, 
5.02, 5.03, 5.04, 5.05, 5.06, 5.07, 5.08, 5.09, 5.1, 5.11, 5.12, 
5.13, 5.14, 5.15, 5.16, 5.17, 5.18, 5.19, 5.2, 5.21, 5.22, 5.23, 
5.24, 5.25, 5.26, 5.27, 5.28, 5.29, 5.3, 5.31, 5.32, 5.33, 5.34, 
5.35, 5.36, 5.37, 5.38, 5.39, 5.4, 5.41, 5.42, 5.43, 5.44, 5.45, 
5.46, 5.47, 5.48, 5.49, 5.5, 5.51, 5.52, 5.53, 5.54, 5.55, 5.56, 
5.57, 5.58, 5.59, 5.6, 5.61, 5.62, 5.63, 5.64, 5.65, 5.66, 5.67, 
5.68, 5.69, 5.7, 5.71, 5.72, 5.73, 5.74, 5.75, 5.76, 5.77, 5.78, 
5.79, 5.8, 5.81, 5.82, 5.83, 5.84, 5.85, 5.86, 5.87, 5.88, 5.89, 
5.9, 5.91, 5.92, 5.93, 5.94, 5.95, 5.96, 5.97, 5.98, 5.99, 6, 
6.01, 6.02, 6.03, 6.04, 6.05, 6.06, 6.07, 6.08, 6.09, 6.1, 6.11, 
6.12, 6.13, 6.14, 6.15, 6.16, 6.17, 6.18, 6.19, 6.2, 6.21, 6.22, 
6.23, 6.24, 6.25, 6.26, 6.27, 6.28, 6.29, 6.3, 6.31, 6.32, 6.33, 
6.34, 6.35, 6.36, 6.37, 6.38, 6.39, 6.4, 6.41, 6.42, 6.43, 6.44, 
6.45, 6.46, 6.47, 6.48, 6.49, 6.5, 6.51, 6.52, 6.53, 6.54, 6.55, 
6.56, 6.57, 6.58, 6.59, 6.6, 6.61, 6.62, 6.63, 6.64, 6.65, 6.66, 
6.67, 6.68, 6.69, 6.7, 6.71, 6.72, 6.73, 6.75, 6.77, 6.78, 6.79, 
6.8, 6.81, 6.82, 6.83, 6.84, 6.85, 6.86, 6.87, 6.88, 6.89, 6.9, 
6.91, 6.92, 6.93, 6.94, 6.95, 6.96, 6.97, 6.98, 6.99, 7, 7.01, 
7.02, 7.03, 7.04, 7.05, 7.06, 7.07, 7.08, 7.09, 7.1, 7.11, 7.12, 
7.13, 7.14, 7.15, 7.16, 7.17, 7.18, 7.19, 7.2, 7.21, 7.22, 7.23, 
7.24, 7.25, 7.26, 7.27, 7.28, 7.29, 7.3, 7.31, 7.32, 7.33, 7.34, 
7.35, 7.36, 7.37, 7.38, 7.39, 7.4, 7.41, 7.42, 7.43, 7.44, 7.45, 
7.46, 7.47, 7.48, 7.49, 7.5, 7.51, 7.52, 7.53, 7.54, 7.55, 7.56, 
7.57, 7.58, 7.59, 7.6, 7.61, 7.62, 7.63, 7.64, 7.65, 7.66, 7.67, 
7.68, 7.69, 7.7, 7.71, 7.74, 7.76, 7.77, 7.78, 7.79, 7.8, 7.81, 
7.82, 7.83, 7.84, 7.85, 7.86, 7.87, 7.88, 7.89, 7.9, 7.91, 7.92, 
7.93, 7.94, 7.96, 7.97, 7.98, 7.99, 8, 8.02, 8.03, 8.04, 8.05, 
8.06, 8.07, 8.08, 8.1, 8.11, 8.13, 8.14, 8.15, 8.16, 8.17, 8.18, 
8.19, 8.2, 8.21, 8.22, 8.24, 8.25, 8.26, 8.27, 8.28, 8.29, 8.31, 
8.32, 8.33, 8.34, 8.35, 8.36, 8.37, 8.38, 8.39, 8.4, 8.41, 8.42, 
8.44, 8.45, 8.46, 8.47, 8.48, 8.49, 8.5, 8.51, 8.52, 8.53, 8.54, 
8.55, 8.56, 8.57, 8.58, 8.59, 8.6, 8.61, 8.62, 8.63, 8.64, 8.65, 
8.66, 8.67, 8.68, 8.69, 8.7, 8.71, 8.74, 8.75, 8.76, 8.77, 8.78, 
8.79, 8.8, 8.81, 8.82, 8.83, 8.84, 8.85, 8.86, 8.87, 8.88, 8.89, 
8.9, 8.91, 8.95, 9, 9.08, 9.09, 9.1, 9.12, 9.13, 9.14, 9.15, 
9.16, 9.17, 9.18, 9.19, 9.2, 9.22, 9.23, 9.24, 9.25, 9.26, 9.27, 
9.28, 9.3, 9.31, 9.32, 9.33, 9.35, 9.36, 9.37, 9.38, 9.39, 9.41, 
9.42, 9.43, 9.44, 9.45, 9.49, 9.53, 9.55, 9.56, 9.57, 9.58, 9.6, 
9.61, 9.62, 9.64, 9.66, 9.67, 9.68, 9.69, 9.71, 9.72, 9.74, 9.75, 
9.76, 9.78, 9.79, 9.8, 9.82, 9.85, 9.86, 9.87, 9.88, 9.89, 9.9, 
9.92, 9.95, 9.96, 9.98, 9.99, 10, 10.01, 10.02, 10.03, 10.04, 
10.05, 10.06, 10.07, 10.13, 10.15, 10.16, 10.18, 10.19, 10.2, 
10.21, 10.22, 10.23, 10.24, 10.26, 10.27, 10.29, 10.3, 10.31, 
10.32, 10.34, 10.35, 10.38, 10.43, 10.45, 10.46, 10.47, 10.48, 
10.5, 10.54, 10.55, 10.57, 10.61, 10.62, 10.64, 10.66, 10.67, 
10.69, 10.7, 10.71, 10.8, 10.89, 10.9, 10.91, 10.93, 10.94, 10.95, 
10.96, 10.97, 11, 11.02, 11.05, 11.07, 11.08, 11.09, 11.1, 11.12, 
11.15, 11.17, 11.2, 11.25, 11.28, 11.29, 11.3, 11.31, 11.32, 
11.33, 11.34, 11.35, 11.37, 11.39, 11.4, 11.42, 11.45, 11.48, 
11.49, 11.5, 11.57, 11.63, 11.66, 11.68, 11.69, 11.7, 11.74, 
11.77, 11.81, 11.84, 11.85, 11.88, 11.91, 11.93, 11.94, 11.96, 
12, 12.05, 12.06, 12.08, 12.1, 12.15, 12.19, 12.21, 12.27, 12.34, 
12.38, 12.41, 12.42, 12.46, 12.52, 12.54, 12.55, 12.56, 12.6, 
12.66, 12.67, 12.71, 12.75, 12.79, 12.83, 12.86, 12.89, 12.91, 
12.94, 12.96, 13, 13.03, 13.04, 13.06, 13.09, 13.14, 13.15, 13.27, 
13.33, 13.5, 13.75, 13.79, 13.85, 13.86, 13.89, 13.91, 13.97, 
14, 14.04, 14.09, 14.14, 14.21, 14.25, 14.29, 14.32, 14.34, 14.4, 
14.46, 14.54, 14.58, 14.59, 14.63, 14.73, 14.85, 15, 15.09, 15.1, 
15.19, 15.26, 15.43, 15.58, 15.63, 15.71, 15.75, 15.83, 15.88, 
16, 16.03, 16.2, 16.36, 16.43, 16.5, 16.62, 16.71, 16.76, 16.88, 
17, 17.05, 17.18, 17.25, 17.28, 17.36, 17.47, 17.55, 17.61, 17.69, 
18, 18.36, 18.41, 18.56, 18.69, 18.9, 19, 19.06, 19.29, 19.64, 
19.76, 19.8, 20, 20.25, 20.57, 20.77, 21, 21.13, 21.21, 21.6, 
21.94, 22.09, 22.24, 22.5, 22.74, 22.85, 23.14, 23.4, 23.63, 
24, 24.3, 24.43, 24.75, 24.92, 25.07, 27, 28.42, 29.7, 30.38, 
30.86, 31.5, 32.4, 33.75, 36, 37.13, 37.8, 38.57, 40.5, 42.43, 
43.2, 43.88, 45, 47.25, 48.6, 49.5, 54, 60, 63, 67.5, 81, 90, 
94.5, 108, 135, 162, 189, NA)), class = c("tbl_df", "tbl", "data.frame"
), row.names = c(NA, -1157L)) 

The graph I'm trying to imitate looks like this

and the median is the median ERA over time.

I know there are multiple questions here and it is fine if you can just answer one. I'm just confused and not very familiar with R. Thus looking up examples of these error messages and how to fix them isn't always super helpful because I just don't really know what I'm doing. I promise I have tried to do it on my own and research solutions, but at this point it's just really frustrating to keep getting an error message on each line of code I try to run. Thank you if you can help.

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