The modal form you are trying to close or hide isn’t on top of the z-order. This error has the following cause and solution:

  • Another modal form is higher in the z-order than the modal form you tried to close or hide. First use either the Unload statement or the Hide method on any modal form higher in the z-order. A modal form is a form displayed by the Show method, with the style argument set to 1 – vbModal.
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