How can I go back to a JSP that connects to a servlet?

Hello everybody,
I'm new to Java/JSP. I have a simple application which consists of 2 JSPs and a servlet. I call the servlet as the action in a form from the first jsp, and then the second JSP is being forwarded by the servlet.
In that 2nd jsp I' ve put a "Back" button that is supposed to send the user back to the 1st jsp. The matter is that I can't go back to the initial page. Instead, an error occurs. When there is no servlet between the pages it works fine.
What could be done for this problem to be solved?
Thanks in advance

Instead, an error occursWhat error? one with a stacktrace? if so post it here.

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