MS access function vba, macro [closed]

Answer 1

error_handler:

Error_handler: msgbox err.number & " - " & err.description

this was giving me an error.

I did not do my error_handler: properly (error_handler:). After my function was completed, it would run into error_handler:msgbox err.number & " - " err.description and give me the message box - saying "0 - " because there was no error. I commented it out and everything seems to work okay. Thanks to @HansUp and everyone else for their help.

Answer 2

For future reference, a typical "complete" error handling structure looks e.g. like this:

Sub MySub() 

On Error GoTo MySub_Err

    ' Stuff


MySub_Exit:
    On Error Resume Next
    ' ... Stuff that always needs to run on exit can go here ...

    ' !! This is the important part that prevents the function 
    ' !! from always running into the error handler:
    Exit Sub

MySub_Err:
    MsgBox Err.Description, vbExclamation, "Runtime Error " & Err.Number & " in MySub"
    Resume MySub_Exit

End Sub

MZ-Tools can create this structure automatically (but customizable).