Error when I use FCM & Websocket togather

Hi

When I use web socket server (B4J) to send a message with FCM I get bellow error :

Code:

  {"data": {"receivertoken": "receivertoken-here","pmsenderid": "SenderId HERE","body": "hi my friend !"},
"to": "AcQQ4p4WI1g:APA91bGhKhiydgATbIkNgzu5F6WGF5pm_HxLM9lNSA7bHM0dg89sCbpgpEQc3srf4J92oZkyKd3DId5HqroBmWMWkGCVMHYvxOY1nYrcV6GnTJ--x2T61igugVdDwgCM-D-OJPzZThze"
}

java.lang.RuntimeException: java.lang.IllegalStateException: Toolkit not initialized
at...  

Error when I use FCM & Websocket togather

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