Unexpected Error in Selenium

I am getting a Unexpected error in some of the Selenium RC code. Some time it w开发者_运维知识库orks fine but sometimes it gives the Unexpected error and the scripts stop at that line only.

Example:

There is script for "Login" than it click on the link than fills some form than press some button.

Sometimes its run till Login, sometimes till click of a link sometimes it executes full.

Please give me some solution for this its urgent.

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You need to setspeed(timeout). After you declare your selenium Hash variable, for it to take at least "timeout" miliseconds between each selenium test case