Custom Thank You Page: 500 Internal Server Error upon Submit

When submitting this particular form I am being forwarded to a 500 Internal Server Error Page. Please Advise

I have checked your form and I can see you're redirecting to a custom link: 

The link itself does not work, it shows the error you're getting, I would suggest you to check the link on your end and ensure it works fine.

Here is also the link you're currently using in your Thank You page: http://falconadjustingservices.marketing4realtors.com/thank-you/ 

Hope this helps. 

Thank you! It is a client's old form and I was not aware it of the external link. 

You're welcome. 

Please if you have any question or need some help, please let us know, we will be more than happy to assist you.