I figured it out. Seems like this only breaks things when you upgrade from a previous version. Click on Settings, Voicemail Admin, Then Settings. My guess is your emailbody is blank. Paste this in
${VM_NAME},\n\nThere is a new voicemail in mailbox ${VM_MAILBOX}:\n\n\tFrom:\t${VM_CALLERID}\n\tLength:\t${VM_DUR} seconds\n\tDate:\t${VM_DATE}\n\nDial *98 to access your voicemail by phone.\nVisit http://AMPWEBADDRESS/ucp to check your voicemail with a web browser.\n