coconut wizard failed to uplaod video due to server error

Hello Basma,

please check your PHP error logs. If you are not sure about how to check the PHP error log, the server technical support should be able to give you a hand.

Or you can install this plugin which makes a list of these errors available in wp-admin: https://wordpress.org/plugins/error-log-monitor/

Then try to upload another video and the error should be recorded in these logs.

Thanks,
Martin