Error when using AutoExtensions transformer

[saywo]

 $configurationData = [
        Configuration::KEY_TRANSFORMERS => [
          AutoExtensions::class,
          ServerSideRendering::class,
          TransformedIdentifier::class,
        ],
      ];

When I added AutoExtensions to Transformers, got an above error. Then I fixed dupilicate of $iterationArray in AmpProject/Validator/Spec/Section/Tags and it is working well.

So, could you fix this problem?

[ediamin]

@saywo Thanks for reporting the issue. I can reproduce this error in PHP 5.6. Are you using the same version? I'll try to fix this issue ASAP.

[saywo]

@ediamin Yes, I'm using the same version(PHP5.6).