اررور: کلاس پیدا نشد؟!؟!

اینم کد صفحه خرید:

 package ir.testiab;

import io.nivad.iab.BillingProcessor;
import io.nivad.iab.TransactionDetails;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;


public class TestIABActivity extends Activity implements BillingProcessor.IBillingHandler {

    private BillingProcessor mNivadBilling;

    private String           keyRSA      = "";
    private String           keyID       = "";
    private String           keySecret   = "";
    private String           keyPurchace = "";


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mNivadBilling = new BillingProcessor(this, keyRSA, keyID, keySecret, this);
    }


    @Override
    public void onProductPurchased(String productId, TransactionDetails details) {
        Toast.makeText(TestIABActivity.this, "ط®ط±غŒط¯ ط¨ط§ ظ…ظˆظپظ‚غŒطھ ط§ظ†ط¬ط§ظ… ط´ط¯", Toast.LENGTH_LONG).show();
        Log.d("LOGG", "ط®ط±غŒط¯ ط¨ط§ ظ…ظˆظپظ‚غŒطھ ط§ظ†ط¬ط§ظ… ط´ط¯");
        Log.d("LOGG", "ط´ظ†ط§ط³ظ‡ ظ‡ط§ : " + productId + " + " + details);
    }


    @Override
    public void onBillingError(int errorCode, Throwable error) {
        Toast.makeText(TestIABActivity.this, "ط®ط·ط§غŒغŒ ط±ط® ط¯ط§ط¯", Toast.LENGTH_LONG).show();
        Log.d("LOGG", "ط®ط·ط§غŒغŒ ط±ط® ط¯ط§ط¯ = " + errorCode + " + " + error);

    }


    @Override
    public void onBillingInitialized() {
        Toast.makeText(TestIABActivity.this, "ط§طھطµط§ظ„ ط¨ط§ ع©ط§ظپظ‡ ط¨ط§ط²ط§ط±", Toast.LENGTH_LONG).show();
        Log.d("LOGG", "ط§طھطµط§ظ„ ط¨ط§ ع©ط§ظپظ‡ ط¨ط§ط²ط§ط±");
    }


    @Override
    public void onPurchaseHistoryRestored() {
        Toast.makeText(TestIABActivity.this, "ط¯ط±غŒط§ظپطھ ظ…ط­طµظˆظ„ط§طھ", Toast.LENGTH_LONG).show();
        Log.d("LOGG", "ط¯ط±غŒط§ظپطھ ظ…ط­طµظˆظ„ط§طھ ط§ظ†ط¬ط§ظ… ط´ط¯");
        for (String sku: mNivadBilling.listOwnedProducts()) {
            Log.d("LOGG", "Owned Product: " + sku);
        }
        if (mNivadBilling.isPurchased(keyPurchace)) {
            Log.d("LOGG", "ع©ط§ط± ظˆغŒعکظ‡ ظ‡ط³طھغŒظ…");
        } else {
            Log.d("LOGG", "ع©ط§ط± ظˆغŒعکظ‡ ظ†غŒط³طھغŒظ…");
        }
    }


    ////////////////////////////////////////////////////////////////////////
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if ( !mNivadBilling.handleActivityResult(requestCode, resultCode, data))
            super.onActivityResult(requestCode, resultCode, data);
    }


    @Override
    public void onDestroy() {
        if (mNivadBilling != null)
            mNivadBilling.release();
        super.onDestroy();
    }
}

اجازه های مانیفست:

    <uses-permission android:name="com.farsitel.bazaar.permission.PAY_THROUGH_BAZAAR" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />