# Error after upgrading to 4.2 clearing cache fails and error: Unknown column last\_built\_date in field list

**URL:** <https://forum.mautic.org/t/error-after-upgrading-to-4-2-clearing-cache-fails-and-error-unknown-column-last-built-date-in-field-list/22866>\
**Category:** Mautic 4 Install/Upgrade Support\
**Created:** [March 1, 2022, 4:08pm UTC](https://forum.mautic.org/t/error-after-upgrading-to-4-2-clearing-cache-fails-and-error-unknown-column-last-built-date-in-field-list/22866 "2022-03-01T16:08:50Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![silavapi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silavapi/32/7424_2.png) [@silavapi](https://forum.mautic.org/u/silavapi)\
**Post date:** [May 26, 2022, 12:52pm UTC](https://forum.mautic.org/t/error-after-upgrading-to-4-2-clearing-cache-fails-and-error-unknown-column-last-built-date-in-field-list/22866/18 "2022-05-26T12:52:52Z")

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A post was split to a new topic: [Problems with failed web update](https://forum.mautic.org/t/problems-with-failed-web-update/24225)

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_[View the full topic](https://forum.mautic.org/t/error-after-upgrading-to-4-2-clearing-cache-fails-and-error-unknown-column-last-built-date-in-field-list/22866)._