R encountered a fatal error.The session was terminated

Hi, welcome!

Very often, this error is related with an out of RAM memory issue, to rule this out, could you tell us, what is the code you are trying to run?
Ideally, could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

If you've never heard of a reprex before, you might want to start by reading this FAQ: