Can't modify extensions

When I attempt to modify any extensions on my AAH 2.8 server I get a message full of mean SQL error messages. Does anyone know how to fix it?\

The error message reads:

INSERT INTO users (extension,password,name,voicemail,ringtimer,noanswer,recording,outboundcid,directdid,didalert,faxexten,faxemail,answer,wait,privacyman) values (“1700”, “”, “test”, “novm”, “”, “”, “out=Adhoc|in=Adhoc”, “”, “”, “”, “default”, “”, “0”, “0”, “0”) [nativecode=1054 ** Unknown column ‘faxexten’ in ‘field list’]

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