java.lang.IllegalStateException: Could not execute method of the activity android

I'm pretty new to Android, and I'm trying to connect to a server on port 25000, and send a String, but when I try, I get an error:

package com.nowebsite.www.myapplication;

import java.io.*;
import java.net.*;

public class PanelSend{

static String serverurl = "Ip Adress";
static int serverport = 25000;

public static void SendCommand(String Command){
    Socket socket = null;
    try{
        System.out.println("Connecting to " + serverurl + " on port " + serverport);
        socket = new Socket(serverurl,serverport);
        socket.setSoTimeout(10000);
        System.out.println("Connected.");
        InputStreamReader inputstreamreader = new InputStreamReader(socket.getInputStream());
        BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
        PrintWriter printwriter = new PrintWriter(socket.getOutputStream(),true);
        printwriter.println(Command);
        String lineread = "";
        if ((lineread = bufferedreader.readLine()) != null){
            System.out.println("Received from Server: " + lineread);
        }
        System.out.println("Closing connection.");
        bufferedreader.close();
        inputstreamreader.close();
        printwriter.close();
        socket.close();

    }catch(UnknownHostException unhe){
        System.out.println("UnknownHostException: " + unhe.getMessage());
    }catch(IOException ioe){
        System.out.println("IOException: " + ioe.getMessage());
    }finally{
       /* try{
            socket.close();//removed because this line was giving me an error
        }catch(IOException ioe){
            System.out.println("IOException: " + ioe.getMessage());
        }*/
    }
}
}

and my AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://ift.tt/nIICcg"
    package="com.nowebsite.www.myapplication" >
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

When I try to use the code, I get this http://ift.tt/1NqV52U all help would be appreciated :)