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Error adding new event to calendar

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Smart GWT 4.1d (2014-01-27)

Had no problem with this call (4.0p for long time):
Code:

...                                               
calendar.showNewEventDialog(newEvent);

But now trying the 4.1d getting this error:

Code:

Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) @com.smartgwt.client.widgets.calendar.Calendar::showNewEventDialog(Lcom/smartgwt/client/widgets/calendar/CalendarEvent;)([Java object: com.smartgwt.client.widgets.calendar.CalendarEvent@2087407895]): Unable to get property 'firstChild' of undefined or null reference
        at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:249)
        at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
        at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
        at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:299)
        at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
        at com.smartgwt.client.widgets.calendar.Calendar.showNewEventDialog(Calendar.java)

Code:

Exception caught: (TypeError) description: Unable to get property 'firstChild' of undefined or null reference number: -2146823281 stack: TypeError: Unable to get property 'firstChild' of undefined or null reference at isc_CanvasItem_placeCanvas (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Forms.js:1300:155) at isc_CanvasItem_moved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Forms.js:1303:767) at isc_DynamicForm_itemsMoved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Forms.js:281:1013) at isc_DynamicForm_handleParentMoved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Forms.js:281:514) at isc_Canvas__fireParentMoved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2096:410) at isc_Canvas_handleParentMoved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2096:244) at isc_Canvas__fireParentMoved (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2096:410) at isc_Canvas__completeMoveBy (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2093:353) at isc_Canvas_moveBy (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2093:199) at isc_Canvas_moveTo (http://localhost:8081/amkailink/amkailink/sc/modules/ISC_Core.js:2116:94): Unable to get property 'firstChild' of undefined or null reference

( com.google.gwt.event.shared.UmbrellaException )

Hope you can fix it easily from the stack trace, so I don't need to create a minimized source code to duplicate it.

Thank you.

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