Problem when running Web Interaction

I have created a Web Interaction (thanks to Robert Lane for helping me 
out), but now when I try to run the Web Interaction, I run into a problem 
on the iSeries. In the Console view, the following messages are logged:

<BR>  An error occurred processing program alias, IWIC_PRC .
<BR>  Please check the host job log for the job, 012388/QUSER/QZRCSRVS.

In the iSeries job log, the following message is logged:

Pointer not set for location referenced

The message details are as follows:

>From program . . . . . . . . . :   ExSndPm 
 
To program . . . . . . . . . . :   QZRCSRVS 
  To library . . . . . . . . . :     QSYS 
  To module  . . . . . . . . . :     QZRCRPC 
  To procedure . . . . . . . . :     CallProgram 
  To statement . . . . . . . . :     164 
 
Time sent  . . . . . . . . . . :   15:17:12.361504

It seems that there is a problem in the passing of parameters. However, I 
am pretty sure that I did not make any mistakes. Has anyone run into the 
same problem, and found a way out of it?

Ewout