qgis - ModuleNotFoundError: No module named 'resources'

I have resources.qrc compiled to resources.py using the following batch file:

@echo off
call "C:\Program Files\QGIS 3.0\bin\o4w_env.bat"
call "C:\Program Files\QGIS 3.0\bin\qt5_env.bat"
call "C:\Program Files\QGIS 3.0\bin\py3_env.bat"

@echo on
pyrcc5 -o resources.py resources.qrc

I import resources at the beginning of the code but i get the following error:

ModuleNotFoundError: No module named 'resources'

I tried editing the .ui file as explained here: QGIS plugin: Problems importing resources (resources_rc) file - plugin doesn't load - PATH problems? But I don't have the exact same lines as mentioned instead of:

I have:

Here is the content of the folder: Does somebody have a clue what is wrong?