Unknown column

[1master1]

This new error is replicating for every few seconds

Code:

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Type: 20 File: (Line no. 0) Message SQL Error: 1054 - Unknown column 'tfd.desc' in 'field list' Query: SELECT t.*, tfd.`desc` AS `xthreads_desc`, t.username AS threadusername, u.username, u.avatar FROM xxx_threads t LEFT JOIN xxx_users u ON (u.uid = t.uid) WHERE t.fid IN (4,148,149) AND t.tid IN (0,'108','11') AND t.visible='1' AND t.closed NOT LIKE 'moved|%' ORDER BY t.dateline DESC LIMIT 0, 10

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What is causing this?