WordPress error: Class Piwik\FrontController does not exists

I am new to Piwik and have installed the current Piwik plugin (Version 1.0.3) on WordPress 4.3. The error I am getting is on every measurement:

Piwik error: Class Piwik\FrontController does not exists.

This looks like an error in the plugin. I tried disabling all the other active plugins and the error persists.

Any clues?

Hi there,

try update both Piwik and WP-Piwik plugin
if you still have a problem report in wp-piwik forum