Can you help me with this mistake
I would like to recommend for any technical query about theme functionality the best choice will be contact theme Author and let them know How to Contact your purchased theme Author, theme author will be happy to answer your query.
If you can help me and advise me who to call
The problem may be related to your hosting configuration or installation. Theme author may not be providing free support regarding to this subject but if you consider paid support, you can check out my services