Today I updated a customers website which use your theme TopClass https://themeforest.net/item/topclass-multipurpose-business-corporate-theme/9094711.

I also update the theme from 3.0.0 to 3.0.2

But when I try to activate the plugin it get this error message:

Fatal error: Cannot redeclare add_js_plugin() (previously declared in /wp-content/themes/topclass/lib/shortcodes/tinymce.button.php:25) in /wp-content/plugins/wp-awesome-faq/lib/tinymce.button.php on line 25

I compare the files and they are equal.
Only the included file jwtheme.tinymce.js differs.

I have the prefix jwtheme_ to topclass_ and also add this prefix to the add_js_plugin function in /wp-content/themes/topclass/lib/shortcodes/tinymce.button.php

Now I was able to activate it.