Traceback (most recent call last):
  File "trezorlib\client.py", line 140, in cancel
  File "trezorlib\client.py", line 158, in _raw_write
  File "trezorlib\transport\bridge.py", line 164, in write
  File "trezorlib\transport\bridge.py", line 71, in write_buf
  File "trezorlib\transport\bridge.py", line 138, in _call
  File "trezorlib\transport\bridge.py", line 47, in call_bridge
trezorlib.transport.TransportException: trezord: post/87 failed with code 400: other call in progress