IBM viewer plug-in reports "1300: Incorrect AFPDS data was found."

[Stephan]

Hi to you all,

I don't know whether this is the appropriate group but I found the
most reasonable threads concerning AFP here.
I'm quite new to AFP and we use ISIS Papyrus for print output. Here's
my question: if our specialists take an AFP file from ISIS and give it
to me, the IBM viewer plug-in (version 2.0.1.4 in IE 5.5 on NT 4)
reports the following to me:

1300: Incorrect AFPDS data was found.
The data length or the data structure is incorrect.

and doesn't show the file's contents. What could be the reason?

And another plea: could anyone of you send me an AFP example file
which should be displayed by the viewer plug-in? I cannot any sample
files, I already googled around.

Any hint for an AFP rookie is greatly appreciated!

Many regards,
Stephan.