At all branches of Wikivoyage a "Fatal exception of type MWException" now occurs. Please check if the extensions Insider and/or RelatedArticles were substituted. Maybe at the end of

RelatedArticles.class.php
Insider.class.php

a line like

Html::openElement( 'ul' ) ) .

is noted. If you will find it then this line(s) should be substituted by

Html::openElement( 'ul', array() ) .

Version: 1.22.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52038