Unsupported operation _Slice

I run into this error:

[TensorRT] ERROR: UffParser: Validator error: pred_sbbox/Slice_15: Unsupported operation _Slice

when I have tf.slice in my model, but according to https://docs.nvidia.com/deeplearning/sdk/tensorrt-support-matrix/index.html, TensorRT should support slice operator, Is there any other slice operator that I can use and also supported by TensorRT ? (I also tried tf.strided_slice, still not worked)

Thanks so much!