@Bernard Yes, you have wrong credentials. This is what's causing the problem. You have changed the settings somehow...
I advise you to clear application data or uninstall and reinstall the application. This will reset the settings to default. Alternatively, you could input the correct settings, but I recommend reinstall... It will be easier for you. Then retry pairing.
Note that you must keep the default settings if you want to connect to GUI-O server!
Best regards,
kl3m3n