'07 510 Clutch Issue

Hi All, So i got my surflex slipper clutch and i while i was doing the install i asked my brother to help hold the bike in gear to break the 27mm nut free that holds the clutch basket in. Well he pulled the clutch lever in. now when i start it and kick it into gear, it stalls immediately, even if the lever is pulled in. It seems like the clutch is simply not disengaging enough. when i pull the clutch lever, my pressure plate moves, but not enough to disengage the gears. the reservoir is surprisingly still full. any advice on what to do now?