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