Returned mail: Can't create output: Undefined error: 0

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The original message was received at Thu, 7 May 1998 10:57:47 -0400 (EDT)
from [207.6.206.2] (may be forged)

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550 <address@hidden>... Can't create output: Undefined error: 0

Reporting-MTA: dns; arl-img-7.compuserve.com
Received-From-MTA: DNS; [207.6.206.2]
Arrival-Date: Thu, 7 May 1998 10:57:47 -0400 (EDT)

Final-Recipient: RFC822; 105527.3461@arl-img-7.compuserve.com
Action: failed
Status: 5.3.0
Last-Attempt-Date: Thu, 7 May 1998 10:59:31 -0400 (EDT)
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: Error Message
>
>
>
>
> Date: 
>
> Thu, 7 May 98 6:14:40 -0400
>
>
>
>
> Gek Woo Tan wrote:
> > 
> > Hi,
> > 
> > Could someone help me?  I created a list of objects and I'm trying to print
> > out the contents of my list:
> > 
> >   id index;
> >   Agent *aAgent;
> > 
> >   index = [Tier1List begin: [self getZone]];
> >   while (aAgent = [index next]) {
> >     blah ... blah ...
> >   }
> > 
> > I get the compilation error:
> > 
> > ModelSwarm.m:138: warning: suggest parentheses around assignment used as
> > truth value
> > (i.e. the "while (aAgent = [index next])" line)
> > 
> > I don't understand the error message.  I don't know if there's some
> > mistake with the syntax.
> > 
>
> The error message is just a warning, and on any system I have used so
> far, it has no effect on execution.  If you want to get rid of the
> annoying message, simply put another layer of parenthesis in your code
> as follows:
>
> while ((aAgent = [index next])) {
>
> Rob Kewley
>
>                   ==================================
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> --- End Message ---