Unable to get value of the property 'visibility' and 'isDrawn'

Hi Team,

I am using GWT SDK 2.4.0, Smartgwt 3.0 and IE9.

In my application I am getting one sporadic issue, but I am not able to identify what exactly causing this issue.

Whenever this issue occurs I get 'Confirmation Window' with 'Unable to get value of the property : Visibility' on closing one more 'Confirmation Window' with 'Unable to get value of the property : isDrawn'. Second window appears for about 4 to 5 times, then I won't be able to click on some of the Buttons in page. In Eclipse Development Mode, I see exceptions listed below.

Exception 1:

15:29:29.653 [ERROR] [sanappclient] 15:29:29.647:MUP9[E]:WARN:Log:Error: 'Unable to get value of the property 'visibility': object is null or undefined' in http://127.0.0.1:54149/sanappclient/sc/modules/ISC_Foundation.js at line 371
crashed in: Layout.$21()
Use a pre-9.0 Internet Explorer for best diagnostics, otherwise Firefox or Chrome
com.smartgwt.client.core.JsObject$SGWT_WARN: 15:29:29.647:MUP9[E]:WARN:Log:Error: 'Unable to get value of the property 'visibility': object is null or undefined' in http://127.0.0.1:54149/sanappclient/sc/modules/ISC_Foundation.js at line 371
crashed in: Layout.$21()
Use a pre-9.0 Internet Explorer for best diagnostics, otherwise Firefox or Chrome
at sun.reflect.GeneratedConstructorAccessor129.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Thread.java:745)


Exception 2:

15:18:33.571 [ERROR] [sanappclient] 15:18:33.564:MUP0:WARN:Log:Error: 'Unable to get value of the property 'isDrawn': object is null or undefined' in http://127.0.0.1:54149/sanappclient/sc/modules/ISC_Core.js at line 2410
crashed in: Canvas.$sy()
Use a pre-9.0 Internet Explorer for best diagnostics, otherwise Firefox or Chrome
com.smartgwt.client.core.JsObject$SGWT_WARN: 15:18:33.564:MUP0:WARN:Log:Error: 'Unable to get value of the property 'isDrawn': object is null or undefined' in http://127.0.0.1:54149/sanappclient/sc/modules/ISC_Core.js at line 2410
crashed in: Canvas.$sy()
Use a pre-9.0 Internet Explorer for best diagnostics, otherwise Firefox or Chrome
at sun.reflect.GeneratedConstructorAccessor129.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:105)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Thread.java:745)



Could you please help me to know what could be the possible reason for this exception.
Your help is appreciated.

Regards
Santosh Murudeshwar