Warning: Cannot modify header information [duplicate]

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• How to fix “Headers already sent” error in PHP 11 answers

I have read the other posts and tried what they say and im having no luck.

I created the pages on my localhost using IIS and everything works, I have uploaded my pages to a free server and now im getting the error even though what is ment to happen happens (the folders get created, image gets moved and info is stored on mysql) its just not going to the profile page instead its giving me the error message :- Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /srv/disk13/1572246/www/http://ift.tt/1OYcpgk) in /srv/disk13/1572246/www/http://ift.tt/1bgggao on line 22

Warning: Cannot modify header information - headers already sent by (output started at /srv/disk13/1572246/www/http://ift.tt/1OYcpgk) in /srv/disk13/1572246/www/http://ift.tt/1bgggao on line 27

--insert.php --

<?php include("includes/connect.php"); ?>

<?php
include("includes/var.php");

//check if passwords match  
if ($password == $cpassword){
    //passwords match - check if file is an image
    if(substr($imageType,0,5) == "image"){
        //check if accounts dir excists
        if (is_dir($accounts)){
        //check if username account excists
            if (is_dir($uploaddir)){
                //Yes users directory exists - Move file to $username
                if(move_uploaded_file($_FILES['image']['tmp_name'], $uploadfile)) {
                    //file moves to folder - insert file to MySQL
                    include("insert_image.php");
                }else{
                    //file does not move
                    echo "There is a problem with $tmp_name";
                }
            }else{
                mkdir($accounts . $uploaddir , 0777);
                mkdir($accounts . $uploaddir . $image_dir, 0777);
                mkdir($accounts . $uploaddir . $video_dir, 0777);
                include("insert_image.php");            
            }
        }else{
            //No account dir exists - create directory
            mkdir($accounts , 0777);
            mkdir($accounts . $uploaddir , 0777);
            mkdir($accounts . $uploaddir . $image_dir, 0777);
            mkdir($accounts . $uploaddir . $video_dir, 0777);
            include("insert_image.php");            
        }
    }else{
        //file is not an image
        echo "This is not an image";
    }
}else{
    //Passwords do not match
    echo "Passwords do not match";
}
?>

--insert_image.php--

<?php

move_uploaded_file($_FILES['image']['tmp_name'], $uploadfile);

//add info to the database.
$sql = "INSERT INTO `apply` (`username`,`email`,`password`,`realname`,`location`,`charname`,`class`,`race`,`mainspec`,`rank`,`image_name`,`avatar`)
    VALUES ('$username','$email','$password','$realname','$country','$charName','$class','$race','$spec','$rank','$imageName','$imageData')";

if (mysql_query($sql,$con)){
    //display the profile
    //header ("Location:index.php");
    $sql = "SELECT * FROM apply WHERE username='$username'";
    $result =mysql_query($sql);
    $row = mysql_fetch_assoc($result);
    $id = $row['id'];

    // Mysql_num_row is counting table row
    $count=mysql_num_rows($result);

    if ($id){
    //if ursername and password is correct get user ID
        if($count==1){
            session_start();
            $_SESSION['loggedin'] = true;
            $sql="UPDATE apply SET logged='Yes' WHERE id='$id'" or die ("cant find learner");
            $result=mysql_query($sql) or die ("this stuffedup");
            //display profile
            header ("Location:profile.php?id=$id");
        }else{
            $_SESSION['loggedin'] = false;
            unset($_SESSION['loggedin']);
        }
    }else{
        echo "No ID";
    }
}else{
    //cant find table
    echo 'Cant find table ' . mysql_error();
}
?>