The search index could not be updated. The site is misconfigured. Contact an administrator. SQLSTATE[42000]: Syntax error or access violation: 1064 unknown table 'tiki_main_67a031366ffb8' in delete request
The most common reason is 8M limit in php. Use Admin->phpinfo to display your current memory_limit. If it is too low (less than 16M or 32M), then edit the php.ini file and increase.
