Hi iwmi0426,
Welcome to the Load Runner Forum :-).
The below error message generally occurs due to correlation.
Please go through the below 3 video tutorials,As I am also a starter like you , I recommend you go through all the Motevich's video tutorials.
http://motevich.blogspot.com/2008/11/automated-correlation-in-loadrunner.html
http://motevich.blogspot.com/2008/11/manual-correlation-in-loadrunner.html
http://motevich.blogspot.com/2007/10/loadrunner-scripts-correlation-tutorial.html
Hope this helps!
Regards,
Srihari