title: aapt.exe finished with non-zero exit value 1 / "R" Cannot Resolve Symbol
body: <p>I'm using a localHTML webview app. It's a basic webView android application ,using a exported html of a website. </p>
  
  <ul>
  <li><p>I used this source code before and it work fine, but then i changed a few things in the web, and exported the same way, the same domain, same folder names etc. But now, when i replace the assests folder i get an error</p></li>
  <li><p><a href="http://i.stack.imgur.com/YsHCM.png" rel="nofollow">Here's the error I'm getting</a></p></li>
  <li><p>Also when i change the assets folder even if everything is the same expect a few more index html and images. The "R" goes "cannot resolve symbol R"</p></li>
  </ul>
  
  <p>-- code --</p>
  
  <pre><code>  package com.zeeroapps.loadlocalhtml;
  
  import android.app.Activity;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.webkit.WebView;
  import android.webkit.WebViewClient;
  
  public class MainActivity extends Activity {
  
      WebView mwebview;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      mwebview= (WebView)findViewById(R.id.webView);
      mwebview.getSettings().setJavaScriptEnabled(true);
      mwebview.getSettings().setJavaScriptEnabled(true);
      mwebview.getSettings().setDomStorageEnabled(true);
      mwebview.getSettings().setUseWideViewPort(true);
      mwebview.getSettings().setLoadWithOverviewMode(true);
      mwebview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
      mwebview.setScrollbarFadingEnabled(false);
  
      try {
          mwebview.loadUrl("file:///android_asset/beyazsapka.net/55x2/index.html");
      } catch (Exception e) {
          e.printStackTrace();
      }
  
      mwebview.setWebViewClient(new WebViewClient() {
          @Override
          public boolean shouldOverrideUrlLoading(WebView view, String url) {
              view.loadUrl(url);
              return true;
          }
      });
  }
  
  @Override
  public void onBackPressed() {
      if (mwebview.canGoBack())
          mwebview.goBack();
      else
          super.onBackPressed();
  }
  </code></pre>
  
  <p>}</p>
  
  <p><strong>Things i tried so far</strong></p>
  
  <ol>
  <li>Chaning buildToolsVersion from 23.0.3, to 22.x.x, 21.x,x , 20.x.x and so on..</li>
  <li>Cleaning and Rebuilding App</li>
  <li>Updating the SDK</li>
  </ol>
  
  <p>How can i solve this problem?
  Thanks.</p>