The method resetStalledJobs() does not exist on Dtc\QueueBundle\Manager\JobManagerInterface. It seems like you code against a sub-type of Dtc\QueueBundle\Manager\JobManagerInterface such as Dtc\QueueBundle\Manager\StallableJobManager.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation