Can't Upload JPEGs to live site (PEL error) I'm unable to upload any jpg/jpeg files to the server, it just comes up with an alert saying "upload failed". After checking the PHP error logs for Craft I found this error message is being created every time I try.

PHP Fatal error:  Class 'lsolesen\pel\PelConvert' not found in .../craft/app/vendor/lsolesen/pel/src/PelDataWindow.php on line 96


Any advice on how to fix this error?

I've tried:


Uploading different files to make sure it wasn't an issue with the one jpg
Uploading different file types (no errors occurred with other image file types)
Several local server fixes I found
@lindseydiloreto in the Craft Slack gave me the solution.

For some reason, the craft/app folder got messed up in the last update. 

Re-downloading and replacing the /app folder fixed the problem