Solved
Unable to Delete folder created by script in Repository
I have used ExportSourceControlledEntitiesToZipFile method to Export Project Data to Zip file in Folder.
I am getting below error if I try to open that folder also.
Most likely the @ is the issue.
I'd recommend rewriting your script to create folders without special characters.
Go onto the server directly to remove this folder.
If you don't have direct server access, you can do some research into escape characters and try to delete it with an escape character at least for the @ symbol
What I'm not sure is if you need to do a URL escape %40 or force it into the jscript as a string. You may have to do it through a service though not the direct execute of the filerepository service