Invalid field name

We have form in an application from Notes 7 that when first saved in Notes 8.5 gives an error message “Invalid File Name” - I cannot find any problems with it - can anybody help? It was fine in Notes 7TIA

John

Subject: File or Field?

Anyway, if it’s fieldCreate a blank form, add the fields from the original form one by one 'til you find the one with the problem

It sounds like corruption of the form entry though