Error upon start-up of R

Error Information: Running into the following Error:

Error: 1:7: unexpected '/'
1: https:/
^
this happens when starting R, and RStudio.
Description of issue -
Error comes up when I am trying to install packages with R and RStudio. Knitting Markdowns or Bookdowns in Rstudio.
Steps taken so far -
Deleted and Reinstalled R and RStudio several times now, always the same error. Changed locale back and forth, no changes. Created new User on my Macbook, R and rstudio are running smoothly, hence it has to be a dependency.

System Information:

R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.4

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats graphics grDevices utils datasets methods base

loaded via a namespace (and not attached):
[1] compiler_4.0.0

Would be super grateful if anybody could help me. Moving all my data over to a new user would really be the last resort. Thank you in advance !

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