Fatal error: Uncaught Error: Class 'Composer\Semver\VersionParser' not found in /websites/se/sema.co.nz/piwik/core/Plugin/Dependency.php:77 Stack trace: #0 /websites/se/sema.co.nz/piwik/core/Plugin/Dependency.php(46): Piwik\Plugin\Dependency->getMissingVersions('3.5.1', '>=3.0.0-b1,<4.0...') #1 /websites/se/sema.co.nz/piwik/core/Plugin.php(422): Piwik\Plugin\Dependency->getMissingDependencies(Array) #2 /websites/se/sema.co.nz/piwik/core/Plugin/Manager.php(859): Piwik\Plugin->getMissingDependencies() #3 /websites/se/sema.co.nz/piwik/core/Plugin/Manager.php(838): Piwik\Plugin\Manager->reloadActivatedPlugin('ExamplePlugin', Array) #4 /websites/se/sema.co.nz/piwik/core/Plugin/Manager.php(690): Piwik\Plugin\Manager->reloadActivatedPlugins() #5 /websites/se/sema.co.nz/piwik/core/Plugin/Manager.php(105): Piwik\Plugin\Manager->loadPlugins(Array) #6 /websites/se/sema.co.nz/piwik/core/Plugin/Manager.php(130): Piwik\Plugin\Manager->loadActivatedPlugins() #7 /websites/se/sema.co.nz/piwik/core/Tracker.php(66): Piwik\Plugin\Manager->lo in /websites/se/sema.co.nz/piwik/core/Plugin/Dependency.php on line 77