Error message: Unexpected token < in JSON at position 0

i have tried to log into the form with the link. the error code is * Unexpected token < in JSON at position 0. it says the form is outdated. i fly out tomorrow!

i have tried chrome, firefox and safari. no browser works.

Welcome to the community, @mrteksun! Have you validated your xlsform through this online validator to see if there are any syntax issues?