Chromecast audio group issues goggle groups or Openhab groups

Im experincing some with my chromcast audio gruops, I defined the responce is very slow and I get errors but I don’t understand them, like this:

2017-10-01 21:19:01.860 [WARN ] [su.litvak.chromecast.api.v2.Channel ] - Error while reading: Could not resolve type id 'DEVICE_UPDATED' into a subtype of [simple type, class su.litvak.chromecast.api.v2.StandardResponse]
 at [Source: N/A; line: -1, column: -1]
2017-10-01 21:19:01.863 [WARN ] [su.litvak.chromecast.api.v2.Channel ] -  <-- {"device":{"capabilities":4,"deviceId":"2f017b59-0f18-5ac3-e223-abd0f7fb2109","name":"Soveværelse","volume":{"level":0.12999999523162842,"muted":false}},"requestId":0,"type":"DEVICE_UPDATED"}

My item file:
Group:Player CC_All_Player_Control “CC_All_Player_Control group”

Group:Dimmer CC_All_Volume_Dimmer "CC_All_Sound_Dimmer" 
Group:String CC_All_String_URL_String "CC_All_Sound_URL" 
//Group:Switch CC_All_Mute  "CC_All_Mute" 	// use the audio gruop	


//control 

Player	CC_all_audioGroup_control 	    "CC_all_audioGroup_control"		(CC_All_Player_Control)						{channel="chromecast:audiogroup:0ad558bf-bc7a-4007-ae4c-83b42d896239:control"}

//Player CC_hele_lejligheden_control 		"CC_hele_lejligheden_control"	(CC_All_Player_Control)						{channel="chromecast:chromecast:0ad558bf-bc7a-4007-ae4c-83b42d896239:control"}
Player CC_Anlaeg_control	              "CC_Anlaeg_control"			 	    (CC_All_Player_Control)						{channel="chromecast:audio:2418719c1adf4393b76a1677ae5eac5b:control"}

Player CC_Sove_control 		              "CC_Sove_control"				      (CC_All_Player_Control) 					{channel="chromecast:audio:2f017b590f185ac3e223abd0f7fb2109:control"}

Player CC_Kokken_control 		            "CC_Kokken_control"			      (CC_All_Player_Control) 					{channel="chromecast:audio:66c695bbdbd0a8cbcef903f1847a34db:control"}
Player CC_TV_control 			              "CC_TV_control"			          (CC_All_Player_Control) 					{channel="chromecast:57e8546ec7288b36af60602fc3847f23:control"}


//Volume

Dimmer	CC_all_audioGroup_dimmer 		            "CC_all_audioGroup_dimmer"		                              						{channel="chromecast:audiogroup:0ad558bf-bc7a-4007-ae4c-83b42d896239:volume"}
//Dimmer 	CC_hele_lejligheden_volume_Dimmer 	  "CC_hele_lejligheden_volume_Dimmer"	  (CC_All_Volume_Dimmer)	  {channel="chromecast:chromecast:0ad558bf-bc7a-4007-ae4c-83b42d896239:volume"}
Dimmer 	CC_Anlaeg_Volume_Dimmer		              "CC_Anlaeg_Volume_Dimmer"		 	        (CC_All_Volume_Dimmer)	 	{channel="chromecast:audio:2418719c1adf4393b76a1677ae5eac5b:volume"}
Dimmer 	CC_Sove_volume_Dimmer			              "CC_Sove_volume_Dimmer"		            (CC_All_Volume_Dimmer)    {channel="chromecast:audio:2f017b590f185ac3e223abd0f7fb2109:volume"}
Dimmer 	CC_Kokken_volume_Dimmer			            "CC_Kokken_volume_Dimmer"		          (CC_All_Volume_Dimmer) 		{channel="chromecast:audio:66c695bbdbd0a8cbcef903f1847a34db:volume"}
//Dimmer CC_TV_volume_Dimmer			              "CC_TV_volume_Dimmer"		              (CC_All_Volume_Dimmer) 		{channel="chromecast:57e8546ec7288b36af60602fc3847f23:volume"}



//URLs

String	CC_all_audioGroup_URL 		"CC_all_audioGroup_URL"			(CC_All_String_URL_String)									{channel="chromecast:audiogroup:0ad558bf-bc7a-4007-ae4c-83b42d896239:playuri"}
//String 	CC_hele_lejligheden_URL  	"CC_hele_lejligheden_URL"			(CC_All_String_URL_String)									{channel="chromecast:chromecast:0ad558bf-bc7a-4007-ae4c-83b42d896239:playuri"} 
String 	CC_Anlaeg_URL  	"CC_Anlaeg_URL"						(CC_All_String_URL_String)									{channel="chromecast:audio:2418719c1adf4393b76a1677ae5eac5b:playuri"} 
String 	CC_Kokken_URL  		"CC_Kokken_URL"					(CC_All_String_URL_String)									{channel="chromecast:audio:66c695bbdbd0a8cbcef903f1847a34db:playuri"} 
String 	CC_Sove_URL  		"CC_Sove_URL"					(CC_All_String_URL_String)									{channel="chromecast:audio:2f017b590f185ac3e223abd0f7fb2109:playuri"} 
String CC_TVSove_URL 			"CC_TVSove_URL"					(CC_All_String_URL_String)									{channel="chromecast:chromecast:57e8546ec7288b36af60602fc3847f23:playuri"} 
String CC_TVStue_URL 			"CC_TVStue_URL"					(CC_All_String_URL_String)									{channel="chromecast:chromecast:ae03d5ff05a30e85e5bb4e379ca13e6b:playuri"} 



//Mute
Switch CC_All_AudioGroup_Mute 		"CC_All_AudioGroup_Mute"			(CC_All_Dimmer_dummy)								{channel="chromecast:audiogroup:0ad558bf-bc7a-4007-ae4c-83b42d896239:mute"}

I discovered that I need to use the goggle group URL to make the whole group for play syncronious and I think it works as it is supposed to. I could use volume and other functions on openhab item group level ect. but I wonder if somebody has more experice with this?