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The method scalarNode() does not exist on Symfony\Component\Config...der\NodeParentInterface. It seems like you code against a sub-type of Symfony\Component\Config...der\NodeParentInterface such as Symfony\Component\Config...ion\Builder\NodeBuilder.
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation