Client Error

Details:

Error: Error: Operation "set" on target "w161" of type "rwt.widgets.GridItem" failed:
c is null
Properties: 
texts = Alle Wagen,1,
cellBackgrounds = null


  Script: {"head":{},"operations":[["set","w15",{"sortDirection":"up"}],["set","w160",{"texts":["Test-Netz CR","0",""]}],["set","w161",{"texts":["Alle Wagen","1",""],"cellBackgrounds":null}],["set","w159",{"texts":["Test-Netz KM","1",""],"cellBackgrounds":[[255,255,0,255],null,null]}]]}
  Stack: rwt.remote.MessageProcessor._processError@http://testsrv2:8080/test2/rwt-resources/rap-client.js:225:3803
rwt.remote.MessageProcessor.processOperationArray@http://testsrv2:8080/test2/rwt-resources/rap-client.js:225:915
rwt.remote.MessageProcessor.processMessage@http://testsrv2:8080/test2/rwt-resources/rap-client.js:225:244
.members._handleSuccess@http://testsrv2:8080/test2/rwt-resources/rap-client.js:229:3426
rwt.remote.Request.prototype.setSuccessHandler/this._success@http://testsrv2:8080/test2/rwt-resources/rap-client.js:98:1010
rwt.remote.Request.prototype._onReadyStateChange@http://testsrv2:8080/test2/rwt-resources/rap-client.js:98:1912
.bind/<@http://testsrv2:8080/test2/rwt-resources/rap-client.js:7:217

  Debug: off
  Request: {"head":{"requestCounter":14},"operations":[["notify","w15","MouseUp",{"x":248,"y":109,"time":15551,"button":1,"shiftKey":false,"ctrlKey":false,"altKey":false}],["notify","w20","Selection",{"button":1,"shiftKey":false,"ctrlKey":false,"altKey":false}],["set","w1",{"cursorLocation":[248,110]}]]}