Bad file name or number

[Warden]

Hello,i edited the script and added some things in it,now when i wanted to run it,it gives me error "bad file name or number" and shows me the line:

> Public Function FileExist(ByVal Filename As String, Optional RAW As Boolean = False) As Boolean
>     ' If debug mode, handle error then exit out
>     If Options.Debug = 1 Then On Error GoTo errorhandler
>
>     If Not RAW Then
> this line –---------->      If LenB(Dir(App.Path & "\" & Filename)) > 0 Then
>             FileExist = True
>         End If
>
>     Else
>
>         If LenB(Dir(Filename)) > 0 Then
>             FileExist = True
>         End If
>     End If
>    
>     ' Error handler
>     Exit Function
> errorhandler:
>     HandleError "FileExist", "modDatabase", Err.Number, Err.Description, Err.Source, Err.HelpContext
>     Err.Clear
>     Exit Function
> End Function

but i even havent touched this line,so can anyone tell me what may be the problem?(i can send the full code if someone can help me,i really need help :( )