How to stop messages from appearing in knitr report

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Very likely the cause of your problem is the missing "+" symbol after the labs() command

average_holds_June %>% 
  mutate(time = as.POSIXct(hms::parse_hm(time))) %>% 
  ggplot(aes(time, avg_holds, color=year)) +
  geom_point() +
  geom_line() +
  scale_x_datetime(date_breaks ="1 hour",date_labels = "%H:%M")+
labs(title= "Average number of calls with excessive hold times") +
theme_classic()

If this doesn't solve your problem, please provide a REPRoducible EXample (reprex) ilustrating your issue.

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