Fixed issue with download_url function which not exists at front end

Author: Eugene Manuilov

classes/Visualizer/Source/Csv/Remote.php

@@ -151,6 +151,8 @@ protected function _get_file_handle( $filename = false ) {
 			return parent::_get_file_handle( $filename );
 		}
 
+		require_once ABSPATH . 'wp-admin/includes/file.php';
+
 		$this->_tmpfile = download_url( $this->_filename );
 
 		return !is_wp_error( $this->_tmpfile ) ? parent::_get_file_handle( $this->_tmpfile ) : false;

readme.txt

@@ -58,6 +58,9 @@ Pay attention that to turn your shortcodes into graphs, your theme has to have `
 
 == Changelog ==
 
+= 1.4.2.1 =
+* Fixed issue with download_url function which not exists at front end
+
 = 1.4.2 =
 * Fixed remote CSV uploading issue when allow_url_fopen option is disabled in php.ini
 * Replaced flattr image on widget and added donate link to plugin meta data