Erreurs 404 wordpress + forum phpbb

Bonjour,
j'ai un bug sur toutes les pages de mon site wordpress
"404 Not Found
The requested URL was not found on this server."
que je n'arrive pas à régler, ainsi que sur le forum phpbb
"
General Error
SQL ERROR [ mysqli ]

User 'cvlegendwp' has exceeded the 'max_questions' resource (current value: 7456) [1226]

An sql error occurred while fetching this page. Please contact an administrator if this problem persists."