运行最新的demo，对元素进行操作时，报错：
java.lang.Exception: An unknown server-side error occurred while processing the command.

log日志：

macaca-android.js:294:10 [master] pid:964 start app with: {"package":"com.github.android_app_bootstrap","activity":"com.github.android_app_bootstrap.activity.WelcomeActivity"}
responseHandler.js:49:14 [master] pid:964 Send HTTP Respone to Client[2017-11-24 18:00:09]: {"sessionId":"8beda65d-7ba5-4a93-9bec-8ae74277dc7c","status":0,"value":"{"app":"/Users/tinating/.macaca-temp/android_app_bootstrap-debug.apk","reuse":1,"platformName":"android","udid":"cd4f47b1"}"}
responseHandler.js:11:12 [master] pid:964 Recieve HTTP Request from Client[2017-11-24 18:00:09]: method: POST url: /wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element, jsonBody: {"using":"id","value":"com.github.android_app_bootstrap:id/mobileNoEditText"}
restart UIAutomatorWD server
uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_RESULT: shortMsg=Process crashed.

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_CODE: 0

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: numtests=1

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: stream=
com.macaca.android.testing.UIAutomatorWD:
INSTRUMENTATION_STATUS: id=AndroidJUnitRunner
INSTRUMENTATION_STATUS: test=MacacaTestRunner
INSTRUMENTATION_STATUS: class=com.macaca.android.testing.UIAutomatorWD
INSTRUMENTATION_STATUS: current=1
INSTRUMENTATION_STATUS_CODE: 1

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: stream=
UIAutomatorWD->http://localhost:9001<-UIAutomatorWD
INSTRUMENTATION_STATUS_CODE: 0

UIAutomatorWD http server ready
proxy.js:55:14 [master] pid:964 Proxy: /wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element:POST to http://127.0.0.1:9001/wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element:POST with body: {"using":"id","value":"com.github.android_app_bootstrap:id/mobileNoEditText"}
proxy.js:85:20 [master] pid:964 Got response with status 200: {"status":0,"value":{"ELEMENT":"1"},"sessionId":null}
session.js:109:14 [master] pid:964 Send HTTP Respone to Client[2017-11-24 18:00:10]: {"status":0,"value":"{"ELEMENT":"1"}","sessionId":null}
responseHandler.js:11:12 [master] pid:964 Recieve HTTP Request from Client[2017-11-24 18:00:10]: method: POST url: /wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element/1/value, jsonBody: {"value":["中文+Test+12345678"]}
restart UIAutomatorWD server
uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_RESULT: shortMsg=Process crashed.
uiautomator-client.js:61:14 [master] pid:964
INSTRUMENTATION_CODE: 0

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: numtests=1

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: stream=
com.macaca.android.testing.UIAutomatorWD:
INSTRUMENTATION_STATUS: id=AndroidJUnitRunner
INSTRUMENTATION_STATUS: test=MacacaTestRunner
INSTRUMENTATION_STATUS: class=com.macaca.android.testing.UIAutomatorWD
INSTRUMENTATION_STATUS: current=1
INSTRUMENTATION_STATUS_CODE: 1

uiautomator-client.js:61:14 [master] pid:964 INSTRUMENTATION_STATUS: stream=
uiautomator-client.js:61:14 [master] pid:964

uiautomator-client.js:61:14 [master] pid:964 UIAutomatorWD->http://localhost:9001<-UIAutomatorWD
UIAutomatorWD http server ready
proxy.js:55:14 [master] pid:964 Proxy: /wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element/1/value:POST to http://127.0.0.1:9001/wd/hub/session/8beda65d-7ba5-4a93-9bec-8ae74277dc7c/element/1/value:POST with body: {"value":["中文+Test+12345678"]}
uiautomator-client.js:61:14 [master] pid:964
INSTRUMENTATION_STATUS_CODE: 0

proxy.js:85:20 [master] pid:964 Got response with status 200: {"status":13,"value":"An unknown server-side error occurred while processing the command.","sessionId":"8beda65d-7ba5-4a93-9bec-8ae74277dc7c"}
session.js:109:14 [master] pid:964 Send HTTP Respone to Client[2017-11-24 18:00:13]: {"status":13,"value":""An unknown server-side error occurred while processing the command."","sessionId":"8beda65d-7ba5-4a93-9bec-8ae74277dc7c"}