Air in your clutch - requiring clutch to be bled...
or
Could be primary chain ratcheted to tight, or drive belt to tight...
or
Primary fluid overfilled causing clutch plates to stick...
or
warped clutch plates or spacer plates...
First thing I would do is bleed the clutch. Next I would pull the primary cover and first check the primary chain tension. If it's good, then use a dial indicator on the end of the clutch pushrod and measure the clutch travel. It should be a minimum of .065. If your clutch is bled free of air and you don't have .065 travel, then you either have a bad master cylinder or bad clutch actuator (located under the transmission side cover).
If you have .065 travel, then I'd check your clutch plates and spacer plates for flat... If they are flat, then I'd suspect possibly the primary was overfilled. Clean the clutch plates, reassemble and refill the primary fluid - then test again!
Do you get clutch drag when starting your bike up cold (when in gear and clutch lever pulled in)?