Forms :: Error 2455 - Invalid Reference To Form

For further details see here: [URL] .....

I have a form with two subforms (the second is the child of the first). I want to filter a combo box in the second subform using the record of the first as the filter.

When I open the form from the object list I get this '2455' error. When I press "end" and the form opens the requery does what I want it to do with no further error, using this code in the "got focus" event of the combo box in the first subform:

Code:

[Forms]![form_candidates]![Form_skill_subform].Form![skill_ID].Requery

I have included this before the requery:

Code:

On Error Resume Next

I have seen the use of

Code:

.recordsource = "..."

instead of the requery