The method add() does not exist on Sonata\AdminBundle\Mapper\BaseMapper. It seems like you code against a sub-type of said class. However, the method does not exist in Sonata\AdminBundle\Mapper\BaseGroupedMapper. Are you sure you never get one of those?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
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$baseMapper->/** @scrutinizer ignore-call */
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add($name, ...$annotation->getSettings());
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}
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}
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abstract protected function getAnnotation(): string;