>I already doublecheck the controlsources, doesn't work, finally i remove all the comboboxes & begin from scratch, no errors again.
>Thanks Cris.
>
>P.S. I'm using Codebook 6.20 and when a controlSource is misconfigurated it is easy managed by the framework (with an fancy messagebox & changing Background color of the control). It is weird!! :|

It's mentioned in the Mere Mortals Developer's Guide because it's so strange. And MM is based off a version of Codebook, IIRC, but it doesn't provide that level of service for this error.

Chris.