py2 conversion

i looked for this in the forums but couldnt find it. How can I convert my pt2 database into pt3 beta 11. when i try to do it I get a message that sats " Currently pokertracker can only convert by usinng hand histories stored in the database. If you have not saved hand histories during imports, the database will not be converted. Would you like to continue with the conversion?" Then if I click yes it does not convert.