Error while training

[trupti18]

/torch/install/share/lua/5.1/rnn/Mufuru.lua:18: attempt to call field 'Unsqueeze' (a nil value)

stack traceback:
[C]: in function 'error'
/torch-cl/install/share/lua/5.1/trepl/init.lua:384: in function 'require'
train.lua:1: in main chunk
[C]: in function 'dofile'
/torch-cl/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
[C]: at 0x004064a0