Neo compilation load error

Hi,

I tried to follow the documentation to run a Neo compilation job on AWS console. I downloaded the model from http://download.tensorflow.org/models/mobilenet_v1_2018_02_22/mobilenet_v1_1.0_224.tgz and uploaded it to S3. I did everything else the same as the documentation https://docs.aws.amazon.com/sagemaker/latest/dg/neo-job-compilation-console.html. But I got this error:
"Load Error: InputConfiguration: Exactly one .pb file is allowed for Tensorflow models."
I checked the tar.gz file that there is only one .pn file. What caused the error?
Thank you very much!