Dear esteem colleagues help me out

Pls help me out with this form, I modified an already existing xlsx form to suit my new survey but got stock with this message while uploading it on odk. X

Welcome to the community, @malisa! It seems like you are using the ODK server? If so, you will have to reach out to the ODK team to find out the issue. However, if you wish to checkout for syntax errors within your xlsform, you could always validate your xlsform through this online validator. The online validator should help you identify syntax errors in your xlsform, making it easy to upload to ODK servers or KoBoToolbox servers.