I. Description of the problem and solve
This problem arises mainly because multiple versions of R software is installed, the old version of R is not deleted. Even if you have uninstalled, it may leave an old version of the directory, in the same folder with the new version , that is to say in the presence of two or more different versions of a new version of R R file folder in the same folder folder , only leaving the desired R version of the folder, other delete the job.
For example, my R version R3.6.1, this version of the R folder in one folder. But at the same time, this folder there are other versions of R folder, such as R3.6.0, this will open a blank situation.
After the old version of the R folder to delete (uninstall and delete), the problem is solved.
Second, additional instructions
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