How to fix this behavior: a form that show an error,but if I put it in edition mode and back to form mode works OK

Question

In a system developed with MS Access 2016.

A form named "Movimientos" has two subforms: "IMP" and "PRO". The VBA code send, at the open, a data to one control en IMP, then occurs an error: says that it does not found the control, if I accept the error (clic End, no develope) the form Movimientos open without de both subforms. If I turn to edit mode and back to Form Mode it works OK.
I used this form many time ago without problems. I tried to recover a old version of the app and sursurprisingly shows this problem. I suspect about tables.
I intented compact and repair, creates a new file and import everything, and I could not use Application.SaveAsText it did'nt work also did'nt work to export de form to .text file to inspect.