Fixed WordPress WP-Media uploading error. Put this code in functions.php file.

Fixed-Media-upload-http-error.php

<?php
/*
* Resolve HTTP Error.
*/
function ms_image_editor_default_to_gd($editors){
	$gd_editor = 'WP_Image_Editor_GD';

	$editors = array_diff( $editors, array( $gd_editor ) );
	array_unshift($editors, $gd_editor);

	return $editors;
}
add_filter('wp_image_editors', 'ms_image_editor_default_to_gd');