Fehlermeldung bei composer update

In ClassAliasMapGenerator.php line 139:

[Error]
 Class "TYPO3\ClassAliasLoader\IncludeFile\CaseSensitiveToken" not found

Lösungsansatz: 

 

composer update --no-plugins
composer update

vendor/bin/typo3 database:updateschema
vendor/bin/typo3 upgrade:run

No Content Object definition found at TypoScript object path "tt_content.list.20.nsguestbook_message"

Ursache: Plugin wurde durch Content-Element ersetzt. 

Datenbankbefehl:
UPDATE `tt_content` SET CType="nsguestbook_message" WHERE list_type="nsguestbook_message";

Weitere Plugin-Einbindungen finden:
SELECT distinct list_type, CType, pid, uid FROM tt_content WHERE CType='list' AND deleted=0;