New Farmbot Not Running

My high school students have built a farmbot. Our IT department has assured a connection/configuration with the farmbot, but we can not get the farmbot to move. The motors are vibrating but nothing is moving. We are receiving gcode/move_absolute errors. Our maintenance tech has checked the wiring and our construction of the hardware, but the farmbot is not moving when we control through myfarmbot. Can someone help us with possible ideas on what is going wrong? Thank you.

Are encoders disabled in the Encoders and Endstops section of the Hardware widget on the Device page? How long do the motors vibrate before stopping?

The encoders are enabled. The track will jump but nothing moves.

Try inverting the encoders?