assertion failed: Signal and slot arguments are not compatible error - I need help understanding the error "arguments'

[AnneRanch]

This post is deleted!

[Christian Ehrlicher]

I really wonder what's so hard to read the examples and documentation. You can not mix new and old signal/slot syntax...
https://wiki.qt.io/New_Signal_Slot_Syntax

[JonB]

@AnneRanch
As we have said many times, you must not mix new style connection syntax (&QPushButton::clicked) with old style syntax (SLOT(&TabWidget_Chat::EmptyTestSlot()) in one connect(). Since you often have problems in this area, we have said you should stick to new style only, I do not know why you use a mixed old style here as it is so easy (and better) to use new style only.