The folder I uploaded is an exact copy of the 'portal' folder that works just fine
If nothing was changed from one that worked, then perhaps your upload method is incorrect. BINARY vs ASCII upload method. Check what you used, and try the other. Also make sure all files made it to the server.
Originally Posted by cbelair
When I delete all files in templates_c, it makes whmcs crash at all
As that's only a temp folder to stored cached templates, it shouldn't "crash" WHMCS unless something more is wrong here. If it were working correctly, it would simply write new files to that folder.
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looks like your best bet is to reinstall whmcs backup your database and do a fresh install then reconnect the database and see what happens. Your problem is probably permissions there is documentation on the whmcs site about how to fix your permissions but if thats to big of a deal just to a reinstall.