Found the syntax error, need help

Whenever I specify a "nodeArm" the car wont load, if i leave it blank the car loads, why? The bold portion causes the error.

//front
{"propulsed":0}
{"selfCollision":false}
{"collision":true}
{"axleBeams":["b3","b1",]}
["FL", "wheel_FL_g", "b0", "b1", 9999, "b2", 1],
{"axleBeams":["b3","b1"]}
["FR", "wheel_FR_g", "b5", "b3", 9999, "b4", -1],
{"axleBeams":[]}
{"enableABS":false}
{"selfCollision":true}

//rear
{"propulsed":1}
{"selfCollision":false}
{"collision":true}
{"axleBeams":["b7","b9",]}
["RL", "wheel_RL_g", "b7", "b6", 9999, "b8", 1],
{"axleBeams":["b9","b7"]}
["RR", "wheel_RR_g", "b9", "b11", 9999, "b10", -1],
{"axleBeams":[]}
{"enableABS":false}
{"selfCollision":true}
],
}
}

- - - Updated - - -

Found the problem, for the wheels to work there must be a engine section, I made an engine section and the wheels now appear and work.