I set up a new (empty) AS project in FB and when I debug (the pre-written class generated, with no tweaks at all) the debugger gives me this:

[SWF] ... 1,150 bytes after decompression

There are a lot of posts of this error but no one explains what it means (and I cant find it in the docs anywhere) and it seems to be benign? Is this just some random ghost in the machine?