J3.x:Extension won't install/3/en
From Joomla! Documentation
(Note that this error is very generic and can apply to many other issues. This is however the only UI error shown as a result of this issue that affects Joomla 3.4.0 ONLY)
(Note that this error is very generic and can apply to many other issues. This is however the only UI error shown as a result of this issue that affects Joomla 3.4.0 ONLY)