The method root() does not seem to exist on object<Symfony\Component...on\Builder\TreeBuilder>.
This check looks for calls to methods that do not seem to exist on a given type.
It looks for the method on the type itself as well as in inherited classes or
implemented interfaces.
This is most likely a typographical error or the method has been renamed.
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}
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$rootNode
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->children()
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->arrayNode('exporter')
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->addDefaultsIfNotSet()
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->children()
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->scalarNode('key')
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->isRequired()
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->cannotBeEmpty()
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->info('Unique key that wraps all the cron configured for the current application.')
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->example('my_symfony_app')
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->end()
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->scalarNode('mailto')
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->cannotBeEmpty()
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->info('Sets the default email address for all cron output to go to.')
This check looks for function calls that miss required arguments.