[User Warning] Couldn't set response type to 404 because of output on line 20 of /home/cloudcre/sites/pg/mysite/code/CustomFooterSiteConfig.php

Source

226 		    $line = $file = null;
227 			if(!headers_sent($file, $line)) {
228 				header($_SERVER['SERVER_PROTOCOL'] . " $this->statusCode " . $this->getStatusDescription());
229 				foreach($this->headers as $header => $value) {
230 					header("$header: $value", true, $this->statusCode);
231 				}
232 			} else {
233 			    // It's critical that these status codes are sent; we need to report a failure if not.
234 			    if($this->statusCode >= 300) {
235 			        user_error("Couldn't set response type to $this->statusCode because of output on line $line of $file", E_USER_WARNING);
236 			    }
237 			}
238 			
239 			// Only show error pages or generic "friendly" errors if the status code signifies
240 			// an error, and the response doesn't have any body yet that might contain
241 			// a more specific error description.

Trace

• Couldn't set response type to 404 because of output on line 20 of /home/cloudcre/sites/pg/mysite/code/CustomFooterSiteConfig.php
  HTTPResponse.php:235
• SS_HTTPResponse->output()
  Director.php:151
• Director::direct(/latest-news/assets/_resampled/resizedimage237153-Img0042048x1536.gif,DataModel)
  main.php:126