Adobe Flash Player 10 ActionScript error #2007

I use 4.5.230 build of ...I use 4.5.230 build of player.swf with viral and gapro plugins and while view at FireFox 3.5.3 have message box with this:
TypeError: Error #2007: Parameter text must be not null.
at flash.text::TextField/set text()
at com.jeroenwijering.plugins::Display/setTitle()
at com.jeroenwijering.plugins::Display/stateHandler()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at com.jeroenwijering.player::Controller/sendEvent()
at com.jeroenwijering.player::Controller/playlistHandler()
at com.jeroenwijering.player::Controller/loadHandler()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at com.jeroenwijering.player::View/sendEvent()
at com.jeroenwijering.player::Player/startPlayer()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at com.jeroenwijering.player::SPLoader/pluginHandler()
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What I do wrong?
Is it possible to solve this problem?