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JavaScript exception "Object doesn't support property or method 'blockOnFieldBusy'"

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Hi

We're using SmartGWT 4.1p (2014-07-08 nightly build).
Under conditions we were not able to determine, an exception is thrown when a FormItem gains focus (user clik, tab, ...) in a form.
Almost all our forms suffer this bug, but not all. Trying with a simple unit test didn't help (not reproduced).

Code:

10:28:33.806 [ERROR] [application] 10:28:33.803:IFCS1:WARN:Log:TypeError: Object doesn't support property or method 'blockOnFieldBusy'
Stack from error.stack:
    FormItem.elementFocus () @ application/sc/modules/ISC_Forms.js:1044:14
    DynamicForm.bubbleItemHandler () @ application/sc/modules/ISC_Forms.js:499:1
    DynamicForm.elementFocus () @ application/sc/modules/ISC_Forms.js:514:1
    FormItem._nativeElementFocus () @ application/sc/modules/ISC_Forms.js:1038:33
    Class.invokeSuper () @ application/sc/modules/ISC_Core.js:272:85
    Class.Super () @ application/sc/modules/ISC_Core.js:264:158
    TextItem._nativeElementFocus () @ application/sc/modules/ISC_Forms.js:1414:554
    FormItem.._nativeFocusHandler () @ application/sc/modules/ISC_Forms.js:598:8
    FormItem._nativeFocusHandler () @ application/sc/modules/ISC_Forms.js:596:196


com.smartgwt.client.core.JsObject$SGWT_WARN: 10:28:33.803:IFCS1:WARN:Log:TypeError: Object doesn't support property or method 'blockOnFieldBusy'
Stack from error.stack:
    FormItem.elementFocus () @ application/sc/modules/ISC_Forms.js:1044:14
    DynamicForm.bubbleItemHandler () @ application/sc/modules/ISC_Forms.js:499:1
    DynamicForm.elementFocus () @ application/sc/modules/ISC_Forms.js:514:1
    FormItem._nativeElementFocus () @ application/sc/modules/ISC_Forms.js:1038:33
    Class.invokeSuper () @ application/sc/modules/ISC_Core.js:272:85
    Class.Super () @ application/sc/modules/ISC_Core.js:264:158
    TextItem._nativeElementFocus () @ application/sc/modules/ISC_Forms.js:1414:554
    FormItem.._nativeFocusHandler () @ application/sc/modules/ISC_Forms.js:598:8
    FormItem._nativeFocusHandler () @ application/sc/modules/ISC_Forms.js:596:196

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    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:293)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Thread.java:662)

This happens only in IE (Chrome and FF ok).
What could cause such problem?

Any help appreciated. Thanks in advance

Regards
Antoine

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