Importing flash into acrobat

i’m importing a flash movie into a PDF document.
the problem is that an old movie i made imports in fine.
i’ve made anew movie with the same settings but when ever i try to import it a box comes up saying…“check proxy or URL” blah blah blah.
i’m so confused.
can anyone tell me why it works for one and not the other.
they have the same settings.
its Flash MX and acrobat 6.
cheers, samsara