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https://www.typo3lexikon.de/typo3-tutorials/fehlermeldungen/oops-an-error-occurred.html
https://www.typo3.net/forum/thematik/zeige/thema/116242/
https://stackoverflow.com/questions/51218468/oops-an-error-occurred-after-typo3-upgrade-7-6-to-8-7
https://talk.typo3.org/t/welcome-to-talk-typo3-org/8
https://forge.typo3.org/issues/78709
https://github.com/lochmueller/staticfilecache/issues/98
https://github.com/AOEpeople/aoe_ipauth/issues/15
http://blog.webcan.de/tag/typo3/
http://blog.johannesklug.de/2012/06/19/oops-an-error-occurred-is-not-a-valid-error-message/
https://jainishsenjaliya.wordpress.com/category/typo3/typo3-error-messages/
https://www.steinberg.net/forums/viewtopic.php?t=112633
https://support.native-instruments.com/hc/en-us/community/posts/115000046169-Activation-and-Order-FAQ-overview
http://typo3.3.n7.nabble.com/Typo3-4-5-11-to-6-2-Upgrade-td283656.html