Phorum cache warnings

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I'm installing Phorum and am getting these warnings:

Warning: fopen(/tmp/install_tmp_sanity_check_cache_dir/sanity_checks/2758/76e3/4cf6/09db/118f/3d84/b799/a790/data.php) [function.fopen]: failed to open stream: Permission denied in /home/nef/public_html/include/cache/file.php on line 110

Warning: fwrite(): supplied argument is not a valid stream resource in /home/nef/public_html/include/cache/file.php on line 111

Warning: fclose(): supplied argument is not a valid stream resource in /home/nef/public_html/include/cache/file.php on line 112

I have Intermediate PHP. The errors didn't stop me from installing, but it means Phorum's cache system can't be used.

Nevermind. After completing the installation, the check succeeds.