After (manual) updating an old piwik installation (i guess something 0.4.x) I get a weird error message:
Fatal error: Class ‘HTML_QuickForm’ not found in /public_html/piwik/core/Form.php on line 112
What I’ve done: I renamed the old directory, uploaded the new files (latest), copied the old config-file. after this, i get an error message that the api plugin cannot be loaded. so i disabled this plugin in the config files. i guess the probleme here was the case sensitive foldername (api) …
any hints whats wrong? i could update the database successfully. but after i cannot login anymore because of the fatal error.
thanks for help in advance.