Project VBA diplay Error94

[elsg]

I try understand why my project display error94...

Runtime errror '94'Invaliduse of Null


lookup my file
https://www.sendspace.com/file/pk2gc1

Thank you!!!

[p45cal]

With some 1400 lines of code in your file in 4 code-modules, at least give us a clue as to where this error occurs.
A bonus would be to tell us what the user is doing when the error occurs.

[elsg]

Sorry, for the incomplete explanation, in UserForm "frmRegistoCrimes" a control, combobox, called cbx_Grupo.

try initialization this Userform.

[p45cal]

There is reference in the code to a sheet called "Freguesias" where cbx_Grupo gets its values from. This sheet doesn't exist in the file you link to. Have you deleted it, or perhaps changed its name to Lista_Freguesias? If so change it back or alter the code with a search and replace.
This won't solve the problem though. It falls over because the combobox has no items in it when the AfterUpdate handler is called when you .cbx_Grupo.Enabled = False in the lsDesabilitar macro.
Without looking too deeply I made an adjustment to the following which you can try:
Private Sub cbx_Grupo_AfterUpdate()
If Not IsNull(Me.cbx_Grupo.List(Me.cbx_Grupo.ListIndex)) Then
Call CarregaMunicipio(Me.cbx_Grupo.List(Me.cbx_Grupo.ListIndex))
End If
End Sub