Enketo form submit is not working on my server

I installed kobo toolbox on google cloud and inserted Enketo API token using following code https://kc.kobotoolbox.org/[username]/api-token … and on submitting form I am getting error like

  • The data server for your form or the Enketo server is down. Please try again later or contact sup...@kobotoolbox.org. (500)

what I need to do to get API token if I am wrong. or any other way to solve this problem.

thank u

Jaya Kumari