Errors with submitted form

Please I need help… I am trying to edit forms after it has been submitted to the server and I get the error - …
Error occured during the loading of this form. We do not recommend you edit this record until this is resolved.

Please contact support@kobotoolbox.org with the link to this page and the error message below:

Start tag expected, ‘<’ not found

I contacted support team as mentioned but they directed me here

@excellency_sunmibola, have you gone through these discussions discussed previously in the community forum? It should help you solve your issue.