The method getCache() does not exist on Doctrine\ORM\Cache\Region. It seems like you code against a sub-type of Doctrine\ORM\Cache\Region such as Doctrine\ORM\Cache\Region\DefaultRegion or Doctrine\ORM\Cache\Region\UpdateTimestampCache.
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation