I am getting a end of the file error..Please help

import android.view.View;
import android.os.Bundle;
import android.widget.EditText;

public class MainActivity extends Activity {
  private static final String PREFS_FILE = "";
  private static final String KEY_CHECKBOX = "key_checkbox";
  private SharedPreferences mSharedPreferences;
  private SharedPreferences.Editor mEditor;
  public CheckBox mCheckBox;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mCheckBox = (CheckBox) findViewById(R.id.checkBox);
    mSharedPreferences = getSharedPreferences(PREFS_FILE, Context.MODE_PRIVATE);
    mEditor = mSharedPreferences.edit();
    boolean mCheckBoxValue = mSharedPreferences.getBoolean("key_checkbox", false);


  }
  protected void onPause()
  {
    super.onPause();
    mEditor.putBoolean("key_checkbox",mCheckBox.isChecked());
    mEditor.apply();
}