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Server Error - 500 Error after upgrading to 18.0.39 | Class 'GraphQL\Utils' not found

Hello everyone,

My server is Windows Server 2012 R2 and I've just updated from Plesk 17.x to Plesk 18.0.39 but when I login I got following error:

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I've tried repair kit and Plesk Reconfigurator but that didn't work. Thank you for your further helps.

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