This topic was closed, but I am still having the same problems as the original poster in this topic: https://forum.posit.co/t/integrated-learnr-tutorial-not-opening-on-desktop/54371.
I have everything updated:
R version 4.0.2 (2020-06-22) -- "Taking Off Again"
Copyright (C) 2020 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin17.0 (64-bit)
RStudio
Version 1.3.1093
> packageVersion("rstudioapi")
[1] ‘0.13’
Here's the error message in the Jobs pane:
Error: lexical error: invalid char in json text.
":"character","attributes":{}<!--html_preserve--> {"type":"l
(right here) ------^
Execution halted