/torch/install/share/lua/5.1/nn/LookupTable.lua:59: attempt to call method 'Contiguous' (a nil value)

[jmfu95]

I want to combine two loss, softmax and kl. So i use the following code:
local nll = nn.ClassNLLCriterion()
local kl = nn.DistKLDivCriterion()
local criterion = nn.ParallelCriterion():add(nll,0.5):add(kl)
and the input is:
{
1 : IntTensor - size: 75x24
2 : IntTensor - size: 75x24
}
output is:
{
1 : IntTensor - size: 75x1
2 : DoubleTensor - size: 75x6
}
But when i run this module, i get the following error:
/torch/install/share/lua/5.1/nn/LookupTable.lua:59: attempt to call method 'Contiguous' (a nil value)
stack traceback:
...shedongyu/torch/install/share/lua/5.1/nn/LookupTable.lua:59: in function 'makeInputContiguous'
...shedongyu/torch/install/share/lua/5.1/nn/LookupTable.lua:72: in function 'func'
...hedongyu/torch/install/share/lua/5.1/nngraph/gmodule.lua:345: in function 'neteval'
...hedongyu/torch/install/share/lua/5.1/nngraph/gmodule.lua:380: in function 'forward'
./trainer.lua:75: in function 'opfunc'
...shedongyu/torch/install/share/lua/5.1/optim/adadelta.lua:31: in function 'optim_method'
./trainer.lua:104: in function 'train'
main.lua:215: in function 'train_loop'
main.lua:407: in function 'main'
main.lua:420: in main chunk
[C]: in function 'dofile'
...ngyu/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: at 0x00406670
I tried, but i can't fix this. Someone knows where the mistake is. Is the input wrong?