pdserving部署问题：TypeError: Couldn't build proto file into descriptor pool!
Created by: coder-sun
TypeError: Couldn't build proto file into descriptor pool!
环境是：
paddle-serving-server-gpu==0.3.2
paddle-serving-client==0.3.1
paddle-serving-app==0.1.2
虚拟机中的ubuntu18.04，没有gpu，只有cpu
