Maybe you will need to upload your question to a publicly hosted server to see if it’s OK. If the same has no issues with the publicly hosted server then it should be an issue with your server.
@Prem, seems like you are trying to design your XLSForm using the select_one_from_file. In this case, this post discussed previously should help you solve your issue:
attached) is common when designing a survey with an XLSForm using select_one_from_file. Is this something we don’t need to worry about? Thank you for your guidance.