The method getCalculatedMatrix() does not exist on GGGGino\WarehousePath\Parser\ParserInterface. It seems like you code against a sub-type of GGGGino\WarehousePath\Parser\ParserInterface such as GGGGino\WarehousePath\Parser\MatrixParser.
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation