If you're the author of the plugin and you wan't to know what's wrong with it - well, everything is.
If you aren't the author, then I STRONGLY suggest you DO NOT use that plugin because it's TERRIBLE. I can't find any piece of the code that is correctly written. Even the #includes are wrong.
If you want a plugin for admin prefixes/colorchat, use this -
https://forums.alliedmods.net/showthread.php?t=297952
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