TensorRT 5.1.2 - trtexec error: UffParser: Unsupported number of graph 0

hi, what is the new output_name for resnet50-infer-5.uff?. This command used to work

./trtexec --uff=/workspace/tensorrt/data/resnet50/resnet50-infer-5.uff --batch=1 --output=GPU_0/tower_0/Softmax --uffInput=input,3,224,224

But now I am getting the error:

[TRT] UffParser: Output error: Output GPU_0/tower_0/Softmax not found