Error

package uz.rtm.digitalgenerationbootcamp;

import android.content.Intent;
import android.os.Bundle;

import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;


public class SignUpActivity extends AppCompatActivity {

    EditText edt_email = findViewById(R.id.edt_email);
    EditText edt_password = findViewById(R.id.edt_password);
    Button btn_sign_up = findViewById(R.id.btn_sign_up);
    Button btn_sign_in = findViewById(R.id.btn_sign_in);
    private FirebaseAuth auth;

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

        //Get Firebase auth instance
        auth = FirebaseAuth.getInstance();


        btn_sign_in.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        btn_sign_up.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String email = edt_email.getText().toString().trim();
                String password = edt_password.getText().toString().trim();

                if (TextUtils.isEmpty(email)) {
                    Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(password)) {
                    Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (password.length() < 6) {
                    Toast.makeText(getApplicationContext(), "Password too short, enter minimum 6 characters!", Toast.LENGTH_SHORT).show();
                    return;
                }


                //create user
                auth.createUserWithEmailAndPassword(email, password)
                        .addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                Toast.makeText(SignUpActivity.this, "createUserWithEmail:onComplete:" + task.isSuccessful(), Toast.LENGTH_SHORT).show();

                                // If sign in fails, display a message to the user. If sign in succeeds
                                // the auth state listener will be notified and logic to handle the
                                // signed in user can be handled in the listener.
                                if (!task.isSuccessful()) {
                                    Toast.makeText(SignUpActivity.this, "Authentication failed." + task.getException(),
                                            Toast.LENGTH_SHORT).show();
                                } else {
                                    startActivity(new Intent(SignUpActivity.this, MainActivity.class));
                                    finish();
                                }
                            }
                        });

            }
        });
    }
}