Why Authorize.net Direct Post Signature Key don’t work?

Hello, guys!

  • I have Magento 2.1.8 and i’m install patch for my project Authorize.Net Direct Post from MD5 to SHA-512 by dint of composer.json.

  • The patch has been applied and I can see it by the module-authorizenet code and settings in the admin panel.enter image description here

  • But i have error ‘Sorry, but something went wrong. Please contact the seller.enter image description here

  • It’s my debug.logenter image description here

Please help me! Thanks)