i think you are missing some instances or movieclip names or they are not on stage
That error usually means something is out of scope of the code trying to work with it, such as the pics not being present when that code executes, possibly being somewhere down a timeline. There are other possible reasons as well, such as misnaming an instance.
If you go to your Publish Settings, in the Flash section there is an option to Permit debugging. If you select that option your error message may also point to a line number following the frame indication.
thanks for your replys.
I have debugged the movie, and it is now saying the following
Attemping to launch and connect to Player using URL /Volumes/Documents/Sketch Collective/Web Sketch/On the Go/Fuggles Website/Flash/Green Website/workinprogress.swf
[SWF] Volumes:Documents:Sketch Collective:Web Sketch:On the Go:Fuggles Website:Flash:Green Website:workinprogress.swf - 2383999 bytes after decompression
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at workinprogress_fla::MainTimeline/clickMenus()[workinprogress_fla.MainTimeline::frame11:13 ]
I am still clueless, every instance name seems absolutely fine and all in place.