Why am I getting 500 error while trying to edit a file?

[Nimrod Golan]

I'm trying to edit an existing branch file according the following doc.

I'm using Postman like the following:

1. Content-Type -> multipart/form-data
2. Body -> form-data with the following key-values pairs
   1. branch : <my-branch>
   2. content : "Updating new content"
   3. message: "new commit message"
   4. sourceCommitId : <commitId>
3. PUT call with URL: <server-path>/rest/api/latest/projects/<project-key>/repos/<repo-slug>/browse/README.md

and I'm getting back the following not informative error message:

{

    "errors": [

        {

            "context": null,

            "message": "An error occurred while processing the request. Check the server logs for more information.",

            "exceptionName": null

        }

    ]

}

What am I doing wrong?