找不到符号符号：变量PROXIMITY_ON_WAKE？

Question

我正在尝试为Android构建一个ROM，一切顺利，但后来我从CM添加了Proximity Wake功能并得到了这个错误：

packages/apps/Settings/src/com/android/settings/DisplaySettings.java:148: cannot find symbol symbol  : 
variable advancedPrefs location: class com.android.settings.DisplaySettings         
advancedPrefs.removePreference(findPreference(KEY_PROXIMITY_WAKE));         ^ 
packages/apps/Settings/src/com/android/settings/DisplaySettings.java:149: cannot find symbol symbol  : 
variable PROXIMITY_ON_WAKE location: class android.provider.Settings.System         
Settings.System.putInt(getContentResolver(), Settings.System.PROXIMITY_ON_WAKE, 1);


^ Note: Some input files use or override a deprecated API. Note: Recompile
with -Xlint:deprecation for details. Note: Some input files use unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 2 errors

当我打开文件时，我发现这一行：

advancedPrefs.removePreference(findPreference(KEY_PROXIMITY_WAKE));             
Settings.System.putInt(getContentResolver(), Settings.System.PROXIMITY_ON_WAKE, 1);

错误说它找不到符号，出了什么问题？