Error install package, failed to lock directory

I am a beginner in RStudio. I try to install a package and there was an error.

package ‘rprojroot’ successfully unpacked and MD5 sums checked
Error in install.packages : ERROR: failed to lock directory ‘C:\Users\mami\Documents\R\win-library\3.6’ for modifying
Try removing ‘C:\Users\mami\Documents\R\win-library\3.6/00LOCK’

What should I do to solve this error?

Follow the instructions on the error message and remove that file.

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What is the command to remove this path? Thank you

You don't need a command, just open the Windows file explorer, look for the file and delete it.

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I tried using this command: remove("C:\Users\mami\Documents\R\win-library\3.6/00LOCK")

and there is an error:
remove("C:\Users\mami\Documents\R\win-library\3.6/00LOCK")
Warning message:
In remove("C:\Users\mami\Documents\R\win-library\3.6/00LOCK") :
object 'C:\Users\mami\Documents\R\win-library\3.6/00LOCK' not found

Can you give another suggestion?