Piwik: PHP upgrade broke Piwik
I have upgraded PHP from 5.3.7 to 5.4.4 on my Debian 6 (Squeeze) system. After this upgrade Piwik stopped working. The following error occurs:
The string to escape is not a valid UTF-8 string in "@CoreHome/getDefaultIndexView.twig".
I tried Googling, but could not get any solution. Anyone knows how to fix this error?
If you have issues with the update process, download Piwik manually and replace it with your installed system.
For security reasons, take a backup from your database and your config file.