@ manicsf. Thanks for posting. First off, Easy Folder Listing doesn’t write files anywhere. So it doesn’t need write permission to do anything.
Secondly, it seems as though you are trying to list the contents of the tmp folder administrator folder and other folders that may be off limits. You probably need to specify a list folder that you have permissions to access so that you can list the contents.
Lastly, from reading your error log, I don’t see where the errors reference any file belonging to Easy Folder Listing.
I hope my analysis will help you with your situation. In all honesty, from what you describe, Easy Folder Listing is not indicated as the reason for your errors. It seems more like a server error that is unrelated to the module itself. You may need to ask your site admins what is going on.