In the last update, the structure for the weapon info was changed. I have compiled a new binary that addresses this change.
You can find the file here: http://maniadminplugin.googlecode.com/files/mani_admin_plugin_v1_2_22_7_BETA_orange_binaries.zip
Please use the latest gametypes.txt file from here: http://development.mani-admin-plugin.com/gametypes.php?game=cstrike
For questions/comments, please post them here: Bug Reports