TYPO3 Exception 1204026251¶
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You probably ran into a race condition which is described in
https://forge.typo3.org/issues/46205 and has been fixed in 6.0.5.
Try to update to a newer TYPO3 version and clear your
Taken from http://stackoverflow.com/questions/16708012/cache-file-could-not-be-written-typo3-6-0-4
Additionally, this error might occur if you are over quota and or the disk is full.