Error building with custom java code [Solved]

I'm doing a game that needs to access the calendar in the mobile and save an event, i've build a java code and created a .jar file using Dr. Java:

 package com.company.productname;
 
 import com.unity3d.player.UnityPlayer;
 import com.unity3d.player.UnityPlayerActivity;
 
 import java.util.Calendar;
 import android.os.Bundle;
 
 import android.app.PendingIntent;
 import android.content.Intent;
 import android.content.Context;
 
 import android.util.Log;
 import android.os.Handler;
 
 public class CalendarDate  {
    public void addEvent(Context ctx, String title) {
     //Log.d(TAG, "AddUsingIntent.addEvent()");
     Intent intent = new Intent(Intent.ACTION_EDIT);
     intent.setType("vnd.android.cursor.item/event");
     intent.putExtra("title", title);
     //intent.putExtra("beginTime", start.getTimeInMillis());
     //intent.putExtra("endTime", end.getTimeInMillis());
     intent.putExtra("allDay", true);
     ctx.startActivity(intent);
 }
 }

and i've added to the mannifest:

   <service android:name="es.astronauts.opengl.CalendarDate" />

to be able to access from a C# code, the code is:

 #if UNITY_ANDROID
     private AndroidJavaObject playerActivityContext;
     #endif
     // Use this for initialization
     void Start () {
         inicio = 2015914730;
         fin = 2015914830;
         #if UNITY_ANDROID && !UNITY_EDITOR
         // Obtain unity context
         if(playerActivityContext == null) {
             AndroidJavaClass actClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
             playerActivityContext = actClass.GetStatic<AndroidJavaObject>("currentActivity");
         }
         AndroidJavaClass jc = new AndroidJavaClass(packageName + ".CalendarDate");
         jc.CallStatic("addEvent", playerActivityContext,Title);
         #endif
 
     
     }

but when i build i get the next error:

can anyone help me? Thank you so much!!