Sizes do not match- error training with my own images

[elleobrien]

When I attempted to train the network with a folder full of my own images using the following code,

$ DATA_ROOT=myimages dataset=folder th main.lua

I get the following error:

$main.lua:182: bad argument #1 to 'copy' (sizes do not match at /tmp/luarocks_cutorch-scm-1-6006/cutorch/lib/THC/generic/THCTensorCopy.c:48)
stack traceback:
        [C]: in function 'copy'
        main.lua:182: in function 'opfunc'
        /home/eobrien/torch/install/share/lua/5.1/optim/adam.lua:37: in function 'adam'
        main.lua:236: in main chunk
        [C]: in function 'dofile'
        ...rien/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
        [C]: at 0x00405d50

Is this due to inconsistencies in the image sizes in my dataset? Or something else?