Playground is not working

[Tyrese-FullStackGenius]

New Issue Checklist

✅ I am not disclosing a vulnerability.
✅ I am not just asking a question.
✅ I have searched through existing issues.
✅ I can reproduce the issue with the latest version of Parse Server.

Issue Description

The graphql playground is not working due to the following error.
Uncaught SyntaxError: Unexpected string (at playground:7:41)

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