Hello Christian,
Thank you so much for using our theme Corporate Plus Pro. As per your question, please try to find the answers below:
1. Have you installed and activate Corporate Plus Pro zip file?
2. Is all the theme file successfully added?
3. Is there any unwanted plugin installed? Please go to Admin Panel > Plugins > Installed Plugins and uninstalled one by one and check.
4. If the problem is not solved, let us know. We will help with you alternative method as well.
5. For more details, you can view the theme documentation as well.
Warm Regards,
Acme Supports