org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible
causes are invalid address of the remote server or browser start-up failure.
2.第二个错误
org.openqa.selenium.SessionNotCreatedException: A new session could not be created. (Original
error: Remote install failed: pkg: /data/local/tmp/c0c81c9ff864615633fa70f2f4d92955.apk
Failure [INSTALL_FAILED_VERSION_DOWNGRADE]) (WARNING: The server did not provide any
stacktrace information)