R cannot be resolved to a variable during importing a project
<p><strong>*<em>here i am pasting the problems details R cannot be resolved to a variable is common problem ,i checked my res folder ,done refreshing project ,cleaning project ,validate *</em> still error is not resolved help me guys...</strong> </p>

<pre><code>    [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\drawable\ic_launcher_wallpaper.png:0: error: Resource entry ic_launcher_wallpaper is already defined.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\drawable\ic_launcher_wallpaper.html:0: Originally defined here.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube1.xml:0: error: Resource entry cube1 is already defined.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube1.html:0: Originally defined here.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube2.xml:0: error: Resource entry cube2 is already defined.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube2.html:0: Originally defined here.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube2_settings.xml:0: error: Resource entry cube2_settings is already defined.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] res\xml\cube2_settings.html:0: Originally defined here.
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\values\index.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\values\shapes.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\values\strings.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\xml\cube1.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\xml\cube2.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\xml\cube2_settings.html:112: error: Error parsing XML: mismatched tag
        [2012-12-14 02:12:38 - com.example.android.livecubes.cube2.CubeWallpaper2Settings] F:\sample projects\Cube\res\xml\index.html:112: error: Error parsing XML: mismatched tag


/*
 * Copyright (C) 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.example.android.livecubes.cube2;

import com.example.android.livecubes.cube2.*;


import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceActivity;

public class CubeWallpaper2Settings extends PreferenceActivity
    implements SharedPreferences.OnSharedPreferenceChangeListener {

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        getPreferenceManager().setSharedPreferencesName(
                CubeWallpaper2.SHARED_PREFS_NAME);
        addPreferencesFromResource(R.xml.cube2_settings);
        getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(
                this);
    }

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(
                this);
        super.onDestroy();
    }

    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
            String key) {
    }
}
</code></pre>
