Incompatible Plug-ins

Mail keeps giving me the following: "Incompatible Plug-ins Disabled. Mail has disabled the following plug-ins - Personal Antispam for Mail. Contact the makers of these plug-ins for versions that are compatible with Mail 4.5 and Message 4.5" I've tried to find solutions through both Mail and Personal Antispam and can't find anything that works. Can someone help me with this? Thanks in advance.