PHP Fatal Error after updating to 3.1

Hi,

After updating the plugin to 3.1 I get the following when I try to access the dashboard area:

PHP Fatal error: Cannot redeclare get_file_description() in P\x1c\xb0uG\x7f on line 78, referer: https://[my-site]/wp-admin/plugins.php

When I disable the plugin by renaming its directory the error goes away. When I reactivate I get the error. I tried reinstalling the plugin Files but I still get the same.