I have included the content-type header:
Are you including the header "Content-Type." Usually, the value is JSON, so the key should be "application/json," but it depends on what you're doing.
Can you include it and let me know if it works?
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Same thing just happened to me, got the same error. For me, the fix was actually clicking into the Add new parameter box and setting the Mark As value to Read. Hope this helps.
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