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Qt Creator - code works, but I get an error message from the IDE

As soon as I run my code (note that I use only C, QT and not C ++), I get the following message from the application output inside the IDE:

Unable to get descriptor for lower: parameter is invalid.

When I delete the makefiles and debug / release files, they start, but after a while I still get the error. This is not such a big problem, but the code works, and everything is fine, but this error appears, and it is quite annoying.

The contents of the .pro file:

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt
QMAKE_CC = gcc -std=c99
SOURCES += main.c

Thanks in advance!

edit: I added the C ++ tag because this error also occurs for the C ++ console application, as in my case.

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Source: https://habr.com/ru/post/1525126/

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