your client is invalid version. Re-install the latest version game client .

Hi, you need for a working game this important software at your PC:
Microsoft .NET Framework 4.6 and Microsoft Visual C++ 2010!
Microsoft .NET Framework 4.6: link: http://www.microsoft.com/en-us/download/confirmation.aspx?id=44928
Microsoft Visual C++ 2010: link: https://www.microsoft.com/en-US/download/details.aspx?id=8328
Than it could be happen that your Antivirus software or your Anti-Malware software
( BitDefender, Emsisoft, Dr.Web, SuperAntiSpyware, Titanium, ZoneAlarm, Avast )
block the client and or closes and shut down the game because it scan aggressive the game folder in the background.
Good Antivirus software / Anti-Malware software with nearly no problems with the XTrap client is: Microsoft Security Essentials, Kaspersky Antivirus.
And use this free software ''IObit Driver Booster 2'' to check your PC for the latest WHQL driver: link: http://www.iobit.com/driver-booster.php
This free software called FileHippo App Manager scans all your standart programs at your PC for new important updates!
FileHippo App Manager: link: http://www.filehippo.com/download_app_manager
And: Please, close any background program which caused problems with the X-trap client!
More informations about background applications: link: https://support.steampowered.com/kb_article.php?ref=8043-EUJN-5239

Good Luck.