What does the occurrence of the "unsupported_grant_type" error signify when trying to obtain a bearer token from the Reddit API using GoLang?

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The "unsupportedgranttype" error signifies that the grant type specified in the API request is not supported by the Reddit API. This error may occur if an incorrect grant type like "password" or "clientcredentials" is specified while requesting a bearer token from the Reddit API using GoLang. To fix the error, you need to ensure that the correct grant type is used in the API request. For example, the Reddit API supports "authorizationcode" grant type for web applications, "refreshtoken" grant type for refreshing access tokens, and "jwtbearer" grant type for server-to-server authentication.