/var/www/web1/html/piwik/core/Updates/0.5.php:
Error trying to execute the query ‘CREATE INDEX index_type_hash ON piwik_log_action (type, hash);’.
The error was: SQLSTATE[42000]: Syntax error or access violation: 1142 INDEX command denied to user ‘webxx’@‘localhost’ for table ‘piwik_log_action’