authentication with cognito aws in android studio - amazon-web-services

Question

Hi I'm realizing the authentication with aws cognito I created the link between aws and android through this class:
import android.content.Context;
import java.util.HashMap;
import java.util.Map;
import com.amazonaws.auth.CognitoCachingCredentialsProvider;
import com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUserPool;
import com.amazonaws.mobileconnectors.cognitoidentityprovider.CognitoUserSession;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
public class Cognito {
public final static String USER_POOL_ID = "USER_POOL_ID";
public final static String IDENTITY_POOL_ID = "IDENTITY_POOL_ID";
public final static String CLIENT_ID = "CLIENT_ID";
public final static String CLIENT_SECRET = null;
public final static Regions REGION = Regions.US_EAST_1;
private static Cognito cognito;
private final CognitoUserPool cognitoUserPool;
private final CognitoCachingCredentialsProvider cognitoCachingCredentialsProvider;
private Cognito(Context context) {
cognitoUserPool = new CognitoUserPool(
context,
USER_POOL_ID,
CLIENT_ID,
CLIENT_SECRET,
REGION
);
cognitoCachingCredentialsProvider = new CognitoCachingCredentialsProvider(
context,
IDENTITY_POOL_ID,
REGION
);
}
public CognitoUserPool getCognitoUserPool() {
return cognitoUserPool;
}
public static Cognito getInstance(Context context) {
if(cognito != null)
return cognito;
return (cognito = new Cognito(context));
}
public void setLogin(CognitoUserSession session) {
cognitoCachingCredentialsProvider.clear();
Map<String,String> login = new HashMap<>();
login.put(
"cognito-idp." + Region.getRegion(REGION) + ".amazonaws.com/" + USER_POOL_ID,
session.getIdToken().getJWTToken()
);
cognitoCachingCredentialsProvider.setLogins(login);
}
}
but I have the following errors when I upload the data and click the button for user registration:
E/AWSKeyValueStore: com.amazonaws.internal.keyvaluestore.KeyNotFoundException: Error occurred while accessing AndroidKeyStore to retrieve the key for keyAlias: com.amazonaws.android.auth.aesKeyStoreAlias
I/AWSKeyValueStore: Deleting the encryption key identified by the keyAlias: com.amazonaws.android.auth.aesKeyStoreAlias
E/AWSKeyValueStore: Error in retrieving the decryption key used to decrypt the data from the persistent store. Returning null for the requested dataKey = IDENTITY_POOL_ID.identityId
E/AWSKeyValueStore: com.amazonaws.internal.keyvaluestore.KeyNotFoundException: Error occurred while accessing AndroidKeyStore to retrieve the key for keyAlias: com.amazonaws.android.auth.aesKeyStoreAlias
I/AWSKeyValueStore: Deleting the encryption key identified by the keyAlias: com.amazonaws.android.auth.aesKeyStoreAlias
E/AWSKeyValueStore: Error in retrieving the decryption key used to decrypt the data from the persistent store. Returning null for the requested dataKey = IDENTITY_POOL_ID.expirationDate
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
how can i solve?