help! error 500

I have an issue with the extension OT Testimonials: when I add and send a review, the server returns error 500! can someone help me?
thank you!!

Hello, Thanks for using our module!
Could you please explain the issue or send screenshot to me?
If you can please send info access to email support: [email protected] I'll check it.
Regards,
Kien

Hi,
Thank you for your reply, my problem is this: I have installed your component ot-testimonial, and I am quite sure I set it correctly, but when I try adding a review from the front end of the site the server responds error 500.
I have sent you via email the info access, can you please help me? if so, the url of the website is www.osmarketing.eu
Thanks a lot

Hello!
It seems this is not our product, please see attacted
We also have a component related to this topic, but not publish, only one module is free: Notice: Undefined variable: target in /home/omegatheme/public_html/components/com_kunena/template/aurelia/layouts/bbcode/url/default.php on line 32
> www.omegatheme.com/joomla/extensions/273-ot-testimonials-slider and it's not module using on your site.

Here it's extensions using on your site, please contact to deverloper: extensions.joomla.org/extensions/extensi...tions/ot-testimonial