What does "can't find linker symbol for virtual table" mean?

[Geoff Alexander]

On 2002-05-14 09:23:29 PST, I wrote:

> Can someone tell me what the following message means:
>
>   (gdb) print name.c_str()
>  can't find linker symbol for virtual table for `FileCollection' value
>
> The FileCollection collection class was compiled with -g using g++ 2.95.3 on
> SuSE Linux/ix86 7.3.  I am running gdb 5.2 also on SuSE Linux/x86 7.3.
>
> Thanks,
> Geoff Alexander

Can someone help with the above question?  I'm getting this for all of my 
classes.

Thanks,
Geoff Alexander