problem with creating of mobiledev

i've a a problem with the creation of mobiledev object, after had connected the my device, in the creation of the mobiledev i got this error

>> m=mobiledev

Undefined variable "mobilesensor" or class "mobilesensor.internal.MobileDevController.isConnectorOn".

Error in mobiledev (line 260)

if ~mobilesensor.internal.MobileDevController.isConnectorOn()