I tried copying the NewFlash module and installed the copied module, then deleted it. Bad move!

I now get this message in the NewsFlash section:
Quote:
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Warning: module2(modules/mod_newsflash.php): failed to open stream: No such file or directory in /home/fpctup/public_html/includes/frontend.html.php on line 54
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Is there an easy fix for this problem? Is there a way to re-install some of the core modules that may get corrupted?
Thanks in advance for your assistance?