Problems with dbhelper - Android Q&A, Help & Troubleshooting

Good day to you all. I have problems with my application, no synchronization with db. An error occurs when you try to log in or register, and the error code indicates a request raw.query.
Code my db.
Code:
CREATE TABLE `logpass` (
`_id` INTEGER PRIMARY KEY AUTOINCREMENT,
`login` TEXT,
`pass` TEXT,
`Name` TEXT,
`Surname` TEXT,
`Groupi` TEXT
);
Code DataBaseHelper
Code:
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
import android.content.ContentValues;
import android.database.Cursor;
public class DataBaseHelper extends SQLiteOpenHelper {
public static String DB_NAME = "auth.db";
private static final int SCHEMA = 1;
static final String TABLE = "logpass";
private static String DB_PATH;
public static final String _id ="_id";
public static final String login = "login";
public static final String pass = "pass";
public static final String Name = "Name";
public static final String Surname = "Surname";
public static final String Groupi = "Groupi";
public SQLiteDatabase database;
private Context myContext;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, SCHEMA);
this.myContext=context;
DB_PATH = "/data/data/com.example.nikita.myapplication/databases/";
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public boolean insert(String login,String pass,String Name,String Surname,String Groupi){
SQLiteDatabase database = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("login",login);
contentValues.put("pass",pass);
contentValues.put("Name",Name);
contentValues.put("Surname",Surname);
contentValues.put("Groupi",Groupi);
long ins = database.insert( "logpass", null, contentValues);
if (ins==-1) return false;
else return true;
}
public Boolean chklogin(String login){
SQLiteDatabase database = this.getReadableDatabase();
Cursor cursor = database.rawQuery("Select * from logpass where login=?",new String[]{login});
if (cursor.getCount()>0) return false;
else return true;
}
//LoginPassword verification
public Boolean loginpassword(String login,String pass){
SQLiteDatabase database = this.getReadableDatabase();
Cursor cursor = database.rawQuery("select * from logpass where login=? and password=?",new String[]{login,pass});
if (cursor.getCount()>0) return true;
else return false;
}
public void create_db(){
InputStream myInput = null;
OutputStream myOutput = null;
try {
File file = new File(DB_PATH + DB_NAME);
if (!file.exists()) {
this.getReadableDatabase();
myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
}
catch(IOException ex){
}
}
public void open() throws SQLException {
String path = DB_PATH + DB_NAME;
database = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
}
And code Main Activity (where to log in)
Code:
public class MainActivity extends AppCompatActivity {
Button b1, b2;
EditText e1, e2;
DataBaseHelper database;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
database = new DataBaseHelper(this);
b1 = (Button) findViewById(R.id.accept);
e1 = (EditText) findViewById(R.id.email);
e2 = (EditText) findViewById(R.id.pass);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String login = e1.getText().toString();
String password = e2.getText().toString();
Boolean Chkloginpass = database.loginpassword(login, password);
if
(Chkloginpass == true) {
Toast.makeText(getApplicationContext(), "Successful log in", Toast.LENGTH_SHORT).show();
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,Main3Activity.class);
startActivity(i);
}
});
} else
Toast.makeText(getApplicationContext(), "Inccorect log or pass", Toast.LENGTH_SHORT).show();
}
});
b2 = (Button) findViewById(R.id.register);
b2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v){
Intent i = new Intent(MainActivity.this, LoginLoginActivity.class);
startActivity(i);
}
});
}
}
Also i can send full database