The method permissions() does not exist on Modules\Authorization\Abstracts\AbstractRole. It seems like you code against a sub-type of Modules\Authorization\Abstracts\AbstractRole such as Modules\Authorization\Roles\AdminRole or Modules\Authorization\Roles\ScripterRole.
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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