The motor may not be spinning freely for a couple of reasons. Please see the below for some further guidance.
1. The Swytch wheel has not been installed correctly, the washers are facing the incorrect way and preventing the wheel to spin
2. The brakes are ribbing again the rim, check that the brake pad have clearance around the tyre
3. There is an internal fault with the powerpack when the kit is on, please work your way through our online diagnostics for more assistance