Content of my error.log file:
[/var/lib/jenkins/jenkins-tmp/jenkins-tmp/workspace/CK2-Release-Linux/clausewitzII/clausewitzlib/sound.cpp:232]: Sound generic_click_04 not found.
[/var/lib/jenkins/jenkins-tmp/jenkins-tmp/workspace/CK2-Release-Linux/clausewitzII/clausewitzlib/sound.cpp:232]: Sound generic_click_04 not found.
[/var/lib/jenkins/jenkins-tmp/jenkins-tmp/workspace/CK2-Release-Linux/clausewitzII/clausewitzlib/sound.cpp:232]: Sound generic_click_04 not found.
[/var/lib/jenkins/jenkins-tmp/jenkins-tmp/workspace/CK2-Release-Linux/clausewitzII/clausewitzlib/sound.cpp:232]: Sound generic_click_04 not found.
AND HERE TERMINAL OUTPUT:
Game update: AppID 203770 "Crusader Kings II", ProcID 28197, IP 0.0.0.0:0
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
Setting breakpad minidump AppID = 203770
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198063239448 [API loaded no]
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
saving roaming config store to 'sharedconfig.vdf'
roaming config store 2 saved successfully
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded: ignored.
Installing breakpad exception handler for appid(gameoverlayui)/version(20130114145737_client)
Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)
Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)
Installing breakpad exception handler for appid(gameoverlayui)/version(1.0_client)
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
(gameoverlayui:28215): Gtk-WARNING **: Unable to locate theme engine in module_path: "clearlooks",
Gtk-Message: Failed to load module "pk-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
[0117/133909:WARNING

roxy_service.cc(646)] PAC support disabled because there is no system implementation