A que es debido este error?

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Too many connections
/home/ramon/public_html/includes/class_core.php on line 312

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Database error in vBulletin 4.0.3:

Invalid SQL:

SELECT languageid,
phrasegroup_global AS phrasegroup_global,
phrasegroup_ecdownloads AS phrasegroup_ecdownloads,
phrasegroup_posting AS phrasegroup_posting,
options AS lang_options,
languagecode AS lang_code,
charset AS lang_charset,
locale AS lang_locale,
imagesoverride AS lang_imagesoverride,
dateoverride AS lang_dateoverride,
timeoverride AS lang_timeoverride,
registereddateoverride AS lang_registereddateoverride,
calformat1override AS lang_calformat1override,
calformat2override AS lang_calformat2override,
logdateoverride AS lang_logdateoverride,
decimalsep AS lang_decimalsep,
thousandsep AS lang_thousandsep
FROM vb_language
WHERE languageid = 2;

MySQL Error : Unknown column 'phrasegroup_ecdownloads' in 'field list'
Error Number : 1054

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