Rmarkdown unable to knit

After I install to the latest Rstudio for mac Catalina, I can't knit my Rmarkdown file. looks like there is something wrong with the 'Rcpp' package, but I don't know how to fix it.

Error in dyn.load(file, DLLpath = DLLpath, ...) :
unable to load shared object '/Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/libs/Rcpp.so':
dlopen(/Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/libs/Rcpp.so, 6): Library not loaded: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libR.dylib
Referenced from: /Library/Frameworks/R.framework/Versions/3.6/Resources/library/Rcpp/libs/Rcpp.so
Reason: image not found
Calls: :: ... asNamespace -> loadNamespace -> library.dynam -> dyn.load
Execution halted

Did you try reinstalling Rcpp ?

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As you are trying to install from source did you already setup your environment ?

hi, I did but failed to install it after I remove the package. I can only drag the 'rcpp' manually to the library, but in this way, it still could not load.

Thank you so much! I followed the instruction and it works rn.

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