xml - Android Studio - Cannot Resolve Symbol 'R' -

this question has been asked many times before, have tried , nothing has worked. cleaning, rebuilding, syncing gradle, editing xml.

i error "cannot resolve symbol 'r'" on every file has 'r.blah.blah' in it.

this line of code error shows up.

int gray = getresources().getcolor(r.color.card_gray);

does have idea why happening? i've tried restarting hasn't worked, i'm thinking it's bug in current android studio version.

edit: android manifest , beginning of java file (one of affected ones)

i have 3 manifests, 1 each module (cardsui, silk, app), i'm making icon pack. error happening in 3 modules.

app:

too long post, here gist: app manifest

cardsui:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"       package="com.afollestad.cardsui"       android:versioncode="1"       android:versionname="1.0">  <uses-sdk android:minsdkversion="15" android:targetsdkversion="18"/>  </manifest> 

silk:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"       package="com.afollestad.silk"       android:versioncode="1"       android:versionname="0.1">  <uses-sdk android:minsdkversion="15" android:targetsdkversion="19"/>  <application/> <!-- required build aar. -->  </manifest> 

example start of affected cardsui file:

package com.afollestad.cardsui;  import android.content.context; import android.util.attributeset; import android.view.view; import android.widget.adapterview; import android.widget.listadapter; import android.widget.listview; 

edit 2: tried creating new project , importing files, , same thing. getting annoying now.... please someone!

thanks

it if have deleted

<string name="action_settings">settings</string> 

in strings.xml, not deleted main.xml file in menu folder.