The 422 (Unprocessable Entity) status code means that the server cannot understand the content of the request. This is generally caused by incorrect syntax in the request.
For example, a common cause of this error is when someone tries to submit a form with invalid data. The server will be unable to process the form and will return a 422 status code.
If you receive a 422 error, it is usually due to a syntax error in the request. To fix this, check the syntax of the request and make sure that all required parameters are included.
RFC #: 4918 Section 11.2
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