This happened after I reinstalled Rstudio. When I was trying to open a new R markdown file, it kept loading and give me the same error as this question Unable to access index for repository: warning in install.packages. Because I'm using a Macbook so the solution there wasn't work for me. I haven't meet a problem like this before, and I'm wondering if it is related to the VPN I'm using. But I've tried open a new rmd file with and without a VPN, none of them worked. Please help me with it because I still need to use Rstudio for my graduate school. Thank you!
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