Generate report Errormessage

Hi there,

I have another issue with generating reports.
Sometimes I get an error message:


What can it be??

its possible that an attribute has not been initialized (a null value), that is, even if value = 0, still need to enter 0 via the option dialog or attribute dialog
best to upload the problem file to check

That’s it! Thank you very much,
I had an empty field. So I entered a space to the fields,
now it works!