[Maciej Szudarek]

I was having the same problem all the time and finally I’ve found the solution. You simply CAN NOT use any of these letters typical for particular countries (like ś, ź, ż, ę, ó, ń etc.) in the name of file neither in the render directory. So just change the name of file and the render directory if needed and everything should be fine. :>

Hope it will work,
Nextion24