top_posters_30.php should be created in the cache folder. If it is not, first check file permissions in the cache and cache builders and cachebuilders/custom directories they should be set to 777.
Files in the cachebuilders/custom should be set to 666.
After that you can try clearing the cache in the cp and or delete all the files in the cache directory except for the index.html file
The original file top_posters_30.php from the install would have been placed in the cache_builders directory
