500 Server Error

I just noticed that your plugin causes error notice. See below

500 – Internal Server Error

If you are the webmaster of this site please log in to Cpanel and check the Error Logs. You will find the exact reason for this error there.

Common reasons for this error are:

Incorrect file/directory permissions: Above 755.
In order files to be processed by the webserver, their permissions have to be equal or below 755. You can update file permissions with a FTP client or through cPanel’s File Manager.

What can be the reason please?

https://www.ads-software.com/plugins/contact-form-7-modules/