mySQL error with query SELECT * FROM nucleus_config: Can't find file: './zevito3_blogs/nucleus_config.frm' (errno: 13 - Permission denied)

mySQL error with query SELECT p.pfile as pfile, e.event as event FROM nucleus_plugin_event as e, nucleus_plugin as p WHERE e.pid=p.pid ORDER BY p.porder ASC: Can't find file: './zevito3_blogs/nucleus_plugin_event.frm' (errno: 13 - Permission denied)