'Undefined index: fileToUpload while load a createpost page?

I have the following PHP code in which i am creating a post with title description and image and i am storing image in a folder images. all things working fine while i create a post this move file to images folder. title , description and imagepath gone to news folder and so on. but when firstly arrive on createnews.php page this error is shown how to handle this error.

NOTE: this error is shown on page load after loading post is submitting correctly

Error

Notice: Undefined index: fileToUpload in E:\Software projects Folder\htdocs\Criclite\createnews.php on line 63 Sorry, there was an error uploading your file.

createnews.php

<!DOCTYPE html>
<html>
<head>
    <title>Add news</title>
</head>
<body>
    <form action="createnews.php" method="post" enctype="multipart/form-data">
        <h2>Add Post Details Here</h2>
        <?php if (isset($_GET['error'])) { ?>
            <p class="error"><?php echo $_GET['error']; ?></p>
        <?php } ?>
        <label>Title</label>
        <input type="text" name="title" placeholder="Enter Post Title"><br>
        <label>Description</label>
        <br>
        <textarea rows="8" cols="100" name="description"></textarea>
        <br><br>
        <label >Select image:</label>
        <input type="file"  name="fileToUpload" 
                   value="" />
            <div>
                <button onclick="allnews()" type="submit"name="upload">
                  Submit
                </button>
            </div>  
     </form>
</body>
</html>

<?php
  include("db_config.php");
  require_once "header.php";

$target_dir = "images/";
 $file_name = date("U").".jpg";
$target_file = $target_dir . $file_name;
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
if(isset($_POST["submit"])) {
  $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
  if($check !== false) {
    echo "File is an image - " . $check["mime"] . ".";
    $uploadOk = 1;
  } else {
    echo "File is not an image.";
    $uploadOk = 0;
  }
}
if (file_exists($target_file)) {
  echo "Sorry, file already exists.";
  $uploadOk = 0;
}
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
  echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
  $uploadOk = 0;
}

if ($uploadOk == 0) {
  echo "Sorry, your file was not uploaded.";
} else {
  if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
$title=$_POST['title'];
$description=$_POST['description'];
    $sql=  "
INSERT INTO `news` ( `title`, `description`, `image`) VALUES ( '".$title."', '".$description."', '".$target_file."')";
if ($link->query($sql) === TRUE) {
   echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.";
}
  } else {
    echo "Sorry, there was an error uploading your file.";
  }
}
?>
php


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Source: Stack Overflow

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