I get this error when trying to add a field or button to a layout. The file has been converted from FileMaker 3 to FileMaker 11 (and now to FM 12).
I can make a new layout with fields, but as soon as I want to add an extra field or copy a field or button from another layout I get this error message.
I am working on a Windows 7 laptop.
I suspect that an error has crept into the file during conversion.
A recovery of the field does not solve the problem.
Anyone any ideas how to solve this ?