Fatal error: Call to protected method HTML_QuickForm2_Renderer_Array::exportMethods() from context 'HTML_QuickForm2_Renderer_Proxy' in /var/www/html/piwik/libs/HTML/QuickForm2/Renderer/Proxy.php on line 113```
http://forum.piwik.org/index.php?showtopic=12211
This is a known incompatibility in HTML_QuickForm2. http://pear.php.net/bugs/bug.php?id=14110. Hence, HTML_QuickForm2 now requires php 5.2+.
The cause is a bug in php 5.0.x/5.1.x. See http://bugs.php.net/bug.php?id=37632 and http://bugs.php.net/bug.php?id=37212. This is worrisome because Piwik uses "protected" access in many places.
(In [2626]) quick fixes #1495 - change protected to public