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    Thrown to indicate that a method has been passed an illegal or inappropriate argument. Make sure your getter and setter methods have the same return/parameter types (that is, String for String, Integer for Integer).

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via Google Groups by Mario Lim, 9 months ago
Can not set com.google.gwt.core.client.JavaScriptObject field com.gwtext.client.core.JsObject.jsObj to com.gwtext.client.widgets.JsonView
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Can not set java.lang.String field Categories.name to java.lang.String
java.lang.IllegalArgumentException: Can not set
 com.google.gwt.core.client.JavaScriptObject field
 com.gwtext.client.core.JsObject.jsObj to
 com.gwtext.client.widgets.JsonView	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:146)	at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:150)	at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)	at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:18)	at java.lang.reflect.Field.get(Field.java:358)	at com.google.gwt.dev.shell.JavaDispatchImpl.getFieldValue(JavaDispatchImpl.java:74)	at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke(IDispatchProxy.java:161)	at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:293)	at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:196)	at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)	at org.eclipse.swt.internal.ole.win32.COM.VtblCall(Native Method)	at org.eclipse.swt.internal.ole.win32.IDispatch.Invoke(IDispatch.java:64)	at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:493)	at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:417)	at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvokeOnWindow(ModuleSpaceIE6.java:63)	at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvoke(ModuleSpaceIE6.java:150)	at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:468)	at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:270)	at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:137)	at com.gwtext.client.widgets.JsonView.filter(JsonView.java:48)	at com.onlineassets.client.widgets.dialog.ImageChooser.createView(ImageChooser.java:199)	at com.onlineassets.client.widgets.dialog.ImageChooser.(ImageChooser.java:64)	at com.onlineassets.client.Chooser$1.onClick(Chooser.java:39)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod(IDispatchImpl.java:126)	at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke(IDispatchProxy.java:150)	at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:293)	at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:196)	at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)	at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)	at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)	at com.google.gwt.dev.GWTShell.pumpEventLoop(GWTShell.java:689)	at com.google.gwt.dev.GWTShell.run(GWTShell.java:550)	at com.google.gwt.dev.GWTShell.main(GWTShell.java:321)