Why my Sign Up button is not working

I want to add new user to my data base so, when i click on the button Sign In it works fine but when I click the Sign Up button it crashes and I get that error message someone help me please !!!!! and this when i clicked on the button Sign up

public class Splashscreen extends Activity implements AdapterView.OnItemSelectedListener {

    //        ************************************************************************************
    Button btnSignIn, btnSignUp;
    LoginDataBaseAdapter loginDataBaseAdapter;
    //        ************************************************************************************

    Spinner spinner;
    LinearLayout ln;

    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        Window window = getWindow();
        window.setFormat(PixelFormat.RGBA_8888);
    }

    /**
     * Called when the activity is first created.
     */
    Thread splashTread;

    //    DatabaseHelper helper = new DatabaseHelper(this);
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splashscreen);


        //        ************************************************************************************
        // create a instance of SQLite Database
        loginDataBaseAdapter = new LoginDataBaseAdapter(this);
        loginDataBaseAdapter = loginDataBaseAdapter.open();

        // Get The Refference Of Buttons
        btnSignIn = (Button) findViewById(R.id.buttonSignIN);
        btnSignUp = (Button) findViewById(R.id.buttonSignUP);

        // Set OnClick Listener on SignUp button
        btnSignUp.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // TODO Auto-generated method stub

                /// Create Intent for SignUpActivity  abd Start The Activity
                Intent intentSignUP = new Intent(getApplicationContext(), SignUPActivity.class);
                startActivity(intentSignUP);
            }
        });
        //        ************************************************************************************

        //**************************************************************
        ln = (LinearLayout) findViewById(R.id.LinLaySpalScrenLogin);
        ln.setVisibility(View.INVISIBLE);
        StartAnimations();

        //        ********************************************************
        // Spinner element
        spinner = (Spinner) findViewById(R.id.fonctionEDT);
        // Spinner click listener
        spinner.setOnItemSelectedListener(this);
        // Spinner Drop down elements
        List<String> fonction = new ArrayList<String>();
        fonction.add("Administrateur");
        fonction.add("Agent laboratoire");
        fonction.add("Chef releve");
        fonction.add("Releveur");
        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, fonction);
        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // attaching data adapter to spinner
        spinner.setAdapter(dataAdapter);
        //        Key_save.setVisibility(View.VISIBLE);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // On selecting a spinner item
        String item = parent.getItemAtPosition(position).toString();
        // Showing selected spinner item
        //  Toast.makeText(parent.getContext(), "Vous avez choisit: " + item, Toast.LENGTH_LONG).show();
    }

    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub
    }

    private void StartAnimations() {
        Animation anim = AnimationUtils.loadAnimation(this, R.anim.alpha);
        anim.reset();
        LinearLayout l = (LinearLayout) findViewById(R.id.lin_lay);
        l.clearAnimation();
        l.startAnimation(anim);
        anim = AnimationUtils.loadAnimation(this, R.anim.translate);
        anim.reset();
        ImageView iv = (ImageView) findViewById(R.id.splash);
        iv.clearAnimation();
        iv.startAnimation(anim);
        ln.setVisibility(View.VISIBLE);
        splashTread = new Thread() {

            @Override
            public void run() {
                try {
                    int waited = 0;
                    // Splash screen pause time
                    while (waited < 3500) {
                        sleep(100);
                        waited += 100;
                    }

                    //Intent intent = new Intent(Splashscreen.this,
                    //      saisieIndex.class);
                    //intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                    //startActivity(intent);
                    //Splashscreen.this.finish();
                }
                catch (InterruptedException e) {
                    // do nothing
                }
                //                finally {
                //                    //Splashscreen.this.finish();
                //                }
                ln.setVisibility(View.VISIBLE);
            }
        };
        splashTread.start();
    }

    //        ************************************************************************************
    // Methos to handleClick Event of Sign In Button
    public void signIn(View V) {
        final Dialog dialog = new Dialog(Splashscreen.this);
        dialog.setContentView(R.layout.login);
        dialog.setTitle("Login");

        // get the Refferences of views
        final EditText editTextUserName = (EditText) dialog.findViewById(R.id.editTextUserNameToLogin);
        final EditText editTextPassword = (EditText) dialog.findViewById(R.id.editTextPasswordToLogin);

        Button btnSignIn = (Button) dialog.findViewById(R.id.buttonSignIn);

        // Set On ClickListener
        btnSignIn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // get The User name and Password
                String userName = editTextUserName.getText().toString();
                String password = editTextPassword.getText().toString();

                // fetch the Password form database for respective user name
                String storedPassword = loginDataBaseAdapter.getSinlgeEntry(userName);

                // check if the Stored password matches with  Password entered by user
                if (password.equals(storedPassword)) {
                    Toast.makeText(Splashscreen.this, "Congrats: Login Successfull", Toast.LENGTH_LONG).show();
                    dialog.dismiss();
                    Intent i = new Intent(Splashscreen.this, welcome.class);
                    startActivity(i);
                }
                else {
                    Toast.makeText(Splashscreen.this, "User Name or Password does not match", Toast.LENGTH_LONG).show();
                }
            }
        });

        dialog.show();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Close The Database
        loginDataBaseAdapter.close();
    }
    //        ************************************************************************************
}