R.java was modified manually. Reverting to generated version
<p>An error how to fix it?
R.java was modified manually! Reverting to generated version!
to drain setContentView(R.layout.main);</p>

<pre><code>enter code here

package com.sposib.urav;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class UravActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */
private EditText A;
private EditText B;
private EditText C;
private Button Clean;
private Button Solve;
private static final double ACCURACY=1000;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    A=(EditText) findViewById(R.id.a);
    B=(EditText) findViewById(R.id.b);
    C=(EditText) findViewById(R.id.c);
    Clean=(Button) findViewById(R.id.cl);
    Solve=(Button) findViewById(R.id.sl);
    Clean.setOnClickListener(this);
    Solve.setOnClickListener(this);
</code></pre>

<p>Thanks for reading</p>
