The method getText() does not exist on Graze\CiffRenderer\Parse...er\FieldParserInterface. It seems like you code against a sub-type of said class. However, the method does not exist in Graze\CiffRenderer\Parse...dParserGraphicPrimitive or Graze\CiffRenderer\Parse...ser\AbstractFieldParser or Graze\CiffRenderer\Parse...ieldParserStaticGraphic or Graze\CiffRenderer\Parse...dParserGraphicPrimitive or Graze\CiffRenderer\Parse...ieldParserStaticGraphic. Are you sure you never get one of those?
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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