error on fine tuning LRR with multi-GPU mode

[Mirsadeghi]

I try to fine tune LRR on my dataset an I set the training to the multi-gpu mode by setting :
opts.train.gpus = [1:3] same as fcnTrain.m function which works on multi-gpu mode in this way.
But i got error while training process want to use "getBatch" function. How can i resolve this error and use multi-gpu mode?