R's default package stats are erased and "Package 'stats' does not have namespace" is displayed

Please help me.
R's default package, stats, has been erased.

The following is the background

• Filter_ and mutate_ are not available in function, so search online
  →A blog says, "You can delete stats with remove" and executes
• Tidyverse and all the other packages that have been useful up until now will be unusable

Currently, the following is displayed:

library(tidyverse)
 Error: package or namespace load failed for 'tidyverse':
  Package 'stats' does not have namespace 

When I restart Rstudio, it shows as follows, and I can't help it.

Preparing to boot - Warning message: 
package 'stats' in options ("defaultPackages") was not found 
 ERROR: package 'stats' does not have a name space
 warning:namespace'stats' is not available and has been replaced
by.GlobalEnv when processing object 'full.model'

 ERROR: package 'stats' does not have a name space
 ERROR: package 'stats' does not have a name space
 ERROR: package 'stats' does not have a name space
 ERROR: package 'stats' does not have a name space

I thought about uninstalling R itself, but I was afraid that the previous files might disappear.
Also, after reinstalling stats, we were unable to install tidyverse and so on.

I'm in despair because I haven't finished my assignment to use it at university.Someone please help me.