when JForum thorws exception it shows messy code,why?

[box Zhang]

This forum is based on Jforum 2.1.8. When I use Jforum and some exceptions were thrown it shows messy code .
How to fix it ?
Thanks!

like this:

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An error has occurred.

For detailed error information, please see the HTML source code, and contact the forum Administrator.

java.util.ArrayList


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