app_functions imports are broken.

################################################################################
##
## BY: WANDERSON M.PIMENTA
## PROJECT MADE WITH: Qt Designer and PySide2
## V: 1.0.0
##
## This project can be used freely for all uses, as long as they maintain the
## respective credits only in the Python scripts, any information in the visual
## interface (GUI) can be modified without any implication.
##
## There are limitations on Qt licenses if you want to use your products
## commercially, I recommend reading them on the official website:
## https://doc.qt.io/qtforpython/licenses.html
##
################################################################################

## ==> GUI FILE
from main import *

class Functions(MainWindow):
    pass

Copypasted the app_functions file, "MainWindow" isn't defined and may cause a crash.

Wanderson-Magalhaes / Simple_PySide_Base

app_functions imports are broken. #18