net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot find function postMessage in object [object]. (http://fast.wistia.com/static/concat/E-v1,iframe-v1.js?lct=1359693751#4)

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net.sourceforge.htmlunit.corejs.javascript.EcmaError: TypeError: Cannot find function postMessage in object [object]. (http://fast.wistia.com/static/concat/E-v1,iframe-v1.js?lct=1359693751#4)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3790)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3768)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3796)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3815)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFunctionError(ScriptRuntime.java:3885)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThisHelper(ScriptRuntime.java:2363)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2330)	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1514)