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Exception Message

#1439228111: Cannot set an alias map as the alias loader is not registered!

RuntimeException thrown in file
[...]/typo3/vendor/typo3/class-alias-loader/src/ClassAliasMap.php in line 59.

Possible Error Sources

Composer install with "--no-scripts" option

Probably you tried to run a composer install/update using the "--no-scripts" option.

composer install --no-scripts

Try to run composer install again without the "--no-scripts" option.

composer install