Access 2016 error message Sub Or Function not defined

[LAAllen]

If IsLoaded("ViewA ctivities Form") Then DoCmd.Requery acForm, ([ViewActivities Form])
this gives me the error: Sub or Function not defined
WHY?

[PhilOfWalton]

Have you defined the IsLoaded function?

The built in IsLoaded works like this

   CurrentProject.AllForms("ViewActivities Form").IsLoaded

I also use this user function (before the above function existed)

Function IsLoaded(ByVal strFormName As String) As Integer
 ' Returns True if the specified form is open in Form view or Datasheet view.
    
    Const conObjStateClosed = 0
    Const conDesignView = 0
    
    If SysCmd(acSysCmdGetObjectState, acForm, strFormName) <> conObjStateClosed Then
        If Forms(strFormName).CurrentView <> conDesignView Then
            IsLoaded = True
        End If
    End If
    
End Function

Phil