Loading External SWF error

I have successfully creatd the transitions for my site with the Loading external SWF file tutorial. I have the first section of the site loading as the first SWF after the initial base animation as the tutorial suggested, but when I press any of the buttons on the site which are on the main timeline I receive the following error. (The animation and transition plays out fine but this is what comes up in the Output panel for FlashMX 2004 Pro).

Target not found: Target=“undefined” Base="_level0.container"
Target not found: Target=“undefined” Base="_level0.container"
undefined
false

If anyone can tell me what this means and what to do to clear it I would be greatly appreciative. I am fairly new to this.
Thank you.

P Bragino