error 41 while building android

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I'm trying to build a ROM for Android and everything is going smooth, but then i added Proximity Wake feature from CM and got this error:

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
when i open up the file i find this lines:

advancedPrefs.removePreference(findPreference(KEY_PROXIMITY_WAKE));
Settings.System.putInt(getContentResolver(), Settings.System.PROXIMITY_ON_WAKE, 1);
The error states that it cannot find a symbol, what is wrong?