ERROR: QXcbConnection: Could not connect to display

[lilouch]

Hi,

I've installed a program and when I ran it, I have this following error:
QXcbConnection: Could not connect to display

I tried to search on the internet but didn't find something for my case.

After running the debugging I saw that the error came from this part: QApplication app(argc,argv);

I use QT_5_4_1

Can someone help me ?

Thanks

[SGaist]

Are you using XCB ?

[lilouch]

@SGaist XCB ?

EDIT: I searched on the internet, and I don't remember to have installed that. I don't know exactly how it works also.

[SGaist]

Then what distribution are you running ? Which Desktop Manager ?