Error 'request_token' should be minimum 10 characters in length.

disclosure360
When sending a post request (using Postman tool) to https://api.kite.trade/session/token and providing api_key, request_token, and checksum
Getting error 'request_token' should be minimum 10 characters in length.
The request_token provided is of more than 10 characters, but still getting error.

I am unable to generate access_token
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