listGrid.setData causing JavascriptException

[SNP]

I am getting below errors when I use listGrid.setData(some array)

SEVERE: Unhandled Exception in com.google.gwt.core.client.JavaScriptException:
(null) @com.smartgwt.client.widgets.Canvas::redraw()([]): null

com.google.gwt.logging.server.RemoteLoggingServiceUtil logOnServer
SEVERE: Unhandled Exception in com.google.gwt.core.client.JavaScriptException:
(null) @com.google.gwt.core.client.impl.Impl::apply(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)
([JavaScript object(2955), JavaScript object(2685),
JavaScript object(3008)]): null

This is occuring on Firefox. In IE its working fine.
Please help.