Incorrect Syntax near '-'. Must Declare the scalar variable "@--"

[PaulG]

Hi there,

We have collected data using survey123 for android and experiencing a send error. The error says Incorrect Syntax near '-'. Must Declare the scalar variable "@HTC". Must declare the scalar variable"@_NewFeatureID_"

But what is confusing  is that  some surveys are sent and others not.  For example,3 out of 8 sent and the other 5 have the error. 

I have edited the xls form to remove the '-' where but that didn't solve the problem?

Any ideas please...

Thanks,