Uses of packages: JuliaDB, ExcelReaders, ExcelFiles and SymPy

Whenever I try to install packages like: JuliaDB, ExcelReaders, ExcelFiles and SymPy, the program shows this message in the console: GitError (Code: ENOTFOUND, Class: Repository, Could not find repository from ‘DocStringExtensions’)
What should I do?

I think this could be your problem,

https://discourse.julialang.org/t/errors-for-git-pkg/9351

Unfortunately it did not work, your solution is for SSL error. I need a solution to this error:
GitError (Code: ENOTFOUND, Class: Repository, could not find repository from ‘DocStringExtensions’)
Thanks

Looks like there is a problem with .julia/v0.6/DocStringExtensions. You could try to remove that directory and try again.

Problem solved, thanks for the help!!