运行例子出现以下错误

[cleverblue]

The following error occurred converting from gpuArray to single:
Conversion to single from gpuArray is not possible
Error in lstm_ff (line 20)
layer.xh(:,r_x(1:end-1),1:end-1)=prelayer;
Error in lstm_init_cpu>@(layer,prelayer)lstm_ff(layer,prelayer) (line 76)
layer.ff=@(layer,prelayer)lstm_ff(layer,prelayer);
Error in model_train (line 39)
model.layers{l}=model.layers{l}.ff(model.layers{l},model.layers{l-1});
Error in model_init>@(model,x,y,nb_epoch,verbose,filename)model_train(model,x,y,nb_epoch,verbose,filename) (line 57)
model.train=@(model,x,y,nb_epoch,verbose,filename)model_train(model,x,y,nb_epoch,verbose,filename);
Error in test_lstm (line 16)
model=model.train(model,x,y,nb_epoch,3,0);
Error in example_Test (line 242)
test_lstm(50,[512,512,512],256,10,64,5);