Xls to xml error

I have this message that appears every time I try to convert the file to xml but in my file I don't have q704
There has been a problem trying to replace $ {q704} with the XPath to the survey element named 'q704'. There is no survey element with this name.

Help me please

This messages means that somewhere in the form you use ${q704}, but q704 is not defined in column name (the variable is not defined).

We are happy to help you however for that we need more information if possible please share your ODK form with us so we can help you more.

Best,
@iamnarendrasingh