Has anyone seen this random block error?

Hello!--- and help please!

I added the random block to my .713 installation on http://www.livermore.bz.

As soon as I click "commit" to add the block, I get:

Fatal error: Failed to initialize session module in /home/jek/www/livermore/modules/gallery/session.php on line 51 Warning: Failed to write session data (user). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

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But then the block (with photos) appears anyway. The only problem then is it appears to make the album itself unavailable, because is I try to go into the album with the random block working (either via the site's manu or by clicking on a random picture) I get:

Fatal error: Cannot redeclare fs_copy() in modules/gallery/platform/fs_unix.php on line 22

Please assist if you can!