lvglEdge, lvgl 8.0.1

Hello, I’m using platformIO and stm32duino and lvgl 8.0.1.
With lvglEdge I create a simple Image and the code.

Now I have 3 files:

img_7_png.c
Testboard_ui.c
Testboard_ui.h

How and where do I have to include the files so that no errors occur? And which function do I have to call in the main code?

At the moment I put all these 3 files in the main folder, and call “BuildPages();” but I receive following during compiling:

image

The beta version of EdgeLine still uses LVGL v7.