Android Question Try Catch - Error message

Public Sub recognizePlateChar(dir As String, fileName As String, extension As String) As String
        NativeMe.InitializeContext
        File.Copy(dir,fileName&extension,global.dir, "1_"&fileName&extension)
        Dim retStr As String = ""
        Dim path As String = global.dir
        Dim name As String = "/1_"&fileName
        retStr = NativeMe.RunMethod("getPlate",  Array (path,name,extension,global.dir))
        Log(retStr)
        retStr = returnPlate(retStr)
        Log(retStr)
        Return(retStr)
End Sub

Public Sub recognizePlateChar(dir As String, fileName As String, extension As String) As String
Try
        NativeMe.InitializeContext
        File.Copy(dir,fileName&extension,global.dir, "1_"&fileName&extension)
        Dim retStr As String = ""
        Dim path As String = global.dir
        Dim name As String = "/1_"&fileName
        retStr = NativeMe.RunMethod("getPlate",  Array (path,name,extension,global.dir))
        Log(retStr)
        retStr = returnPlate(retStr)
        Log(retStr)
        Return(retStr)
Catch
    Return("")
End Try
End Sub