Your log shows you are using a GSX customization which was made with a very early version GSX L2 version, one that used a different standard to specifiy logos which was updated a couple of week after release, so existings customization files made with that early version won't work.
And, it also requires a custom texture logo "QATAR_AIRWAYS_EMBLEM" which is not available with GSX so, you must be sure that one is present in your %APPDATA%\Virtuali\GSX folder. If you haven't made the custom logo yourself, be sure you ask it to whoever made the customization.