Error getting device API level.

报错：

An unknown server-side error occurred while processing the command. Original error: Error getting device API level. Original error: Error executing adbExec. Original error: 'Command '/android-sdk-macosx/platform-tools/adb -P 5037 -s d69721e shell getprop ro.build.version.sdk' timed out after 20000ms'. Try to increase the 20000ms adb execution timeout represented by 'adbExecTimeout' capability

解决：重启手机