Enketo form server

Loading Error
An error occurred during the loading of this form. We do not recommend you use this form for data entry until this is resolved.

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

Could not connect with Form Server.

uploaded form not accessible by the data collectors and displaying this massage to them, any ideas?

Follow the guidance at https://docs.getodk.org/central-troubleshooting/#preview-could-not-connect-with-server.