Debug (line 243 of ViewableData.php):
SilverStripe\ErrorPage\ErrorPageController created with a failover class of SilverStripe\ErrorPage\ErrorPage
ERROR [User Warning]: Couldn't set response type to 404 because of output on line 141 of /srv/users/ao-destinations/apps/ao-destinations/releases/12/vendor/silverstripe/framework/src/Dev/Debug.php
IN GET /page-not-found/?debugfailover=1&isDev=1
Line 397 in /srv/users/ao-destinations/apps/ao-destinations/releases/12/vendor/silverstripe/framework/src/Control/HTTPResponse.php
Source
======
388: } elseif ($this->getStatusCode() >= 300) {
389: // It's critical that these status codes are sent; we need to report a failure if not.
390: user_error(
391: sprintf(
392: "Couldn't set response type to %d because of output on line %s of %s",
393: $this->getStatusCode(),
394: $line,
395: $file
396: ),
* 397: E_USER_WARNING
398: );
399: }
400: }
401:
402: /**
403: * Output body of this response to the browser
Trace
=====
user_error(Couldn't set response type to 404 because of output on line 141 of /srv/users/ao-destinations/apps/ao-destinations/releases/12/vendor/silverstripe/framework/src/Dev/Debug.php, 512)
HTTPResponse.php:397
SilverStripe\Control\HTTPResponse->outputHeaders()
HTTPResponse.php:343
SilverStripe\Control\HTTPResponse->output()
index.php:27
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