RPC tracker could not start scheduler

Application
3

Server List
----------------------------
server-address key
----------------------------
10.73.194.143:47290 server:android
10.73.186.140:54754 server:android1
----------------------------

Queue Status
----------------------------
key free pending
----------------------------

Here’s my query_rpc_tracker output. I have two devices runing RPC app in the same local network. My settings for the app are:
Address: 10.46.144.59
Port: 9190
Key: android
Keep RPC Alive enabled

Here’s how I ran android tracker in the background:
python3 -m tvm.exec.rpc_tracker --host=10.46.144.59 --port 9190 --no-fork

Thanks