"cannot convert 'struct THFloatTensor *' to 'struct THCudaTensor *'" when running the single machine cam demo

Hi,
I'm running on a mac 15" with nvidia. Trying to run with gpu yields out of memory.
Running without a gpu yields this:

`qlua webcam/single_machine_demo.lua -gpu -1 -use_cudnn 0
`
> Found Environment variable CUDNN_PATH = /Developer/NVIDIA/cudnn/lib/libcudnn.dylib
> loading checkpoint from data/models/densecap/densecap-pretrained-vgg16.t7
> done loading checkpoint
> Warning: cudnn.convert does not work with nngraph yet. Ignoring nn.gModuleinitializing camera
> camera initialized
> qlua: /Users/yosit/torch/install/share/lua/5.1/nn/Container.lua:67:
> In 1 module of nn.Sequential:
> In 1 module of nn.Sequential:
> /Users/yosit/torch/install/share/lua/5.1/nn/THNN.lua:110: bad argument #3 to 'v' (cannot convert 'struct THFloatTensor *' to 'struct THCudaTensor *')
> stack traceback:
> [C]: in function 'v'
> /Users/yosit/torch/install/share/lua/5.1/nn/THNN.lua:110: in function 'SpatialConvolutionMM_updateOutput'
> ...it/torch/install/share/lua/5.1/nn/SpatialConvolution.lua:96: in function <...it/torch/install/share/lua/5.1/nn/SpatialConvolution.lua:92>
> [C]: in function 'xpcall'
> /Users/yosit/torch/install/share/lua/5.1/nn/Container.lua:63: in function 'rethrowErrors'
> /Users/yosit/torch/install/share/lua/5.1/nn/Sequential.lua:44: in function
> [C]: in function 'xpcall'
> /Users/yosit/torch/install/share/lua/5.1/nn/Container.lua:63: in function 'rethrowErrors'
> /Users/yosit/torch/install/share/lua/5.1/nn/Sequential.lua:44: in function 'forward'
> ./densecap/DenseCapModel.lua:253: in function 'forward'
> ./densecap/DenseCapModel.lua:321: in function 'forward_test'
> webcam/single_machine_demo.lua:76: in function 'run_model'
> webcam/single_machine_demo.lua:215: in function 'main'
> webcam/single_machine_demo.lua:256: in main chunk
>
> WARNING: If you see a stack trace below, it doesn't point to the place where this error occurred. Please use only the one above.
> stack traceback:
> [C]: at 0x010e984870
> [C]: in function 'error'
> /Users/yosit/torch/install/share/lua/5.1/nn/Container.lua:67: in function 'rethrowErrors'
> /Users/yosit/torch/install/share/lua/5.1/nn/Sequential.lua:44: in function 'forward'
> ./densecap/DenseCapModel.lua:253: in function 'forward'
> ./densecap/DenseCapModel.lua:321: in function 'forward_test'
> webcam/single_machine_demo.lua:76: in function 'run_model'
> webcam/single_machine_demo.lua:215: in function 'main'
> webcam/single_machine_demo.lua:256: in main chunk
>