./MainActivity.java:24: error: method isChecked in class CheckBox cannot be applied to given types,Trouble with boolean

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

public class MainActivity extends Activity {
  private static final String PREFS_FILE = "com.packagename.preferences";
  private static final String KEY_CHECKBOX = "KEY_CHECKBOX";
  private SharedPreferences.Editor mEditor;
  private SharedPreferences mSharedPreferences;
  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();
  }

  @Override
  protected void onPause () {
    super.onPause();
    if (mSharedPreferences.getBoolean(KEY_CHECKBOX, mCheckBox.isChecked(false))) {
    mCheckBox.setChecked(true);
  } else {
    mCheckBox.setChecked(false);
    }
  }
}