'HTTP Error 400 Bad request' while attempting to call 'create_shared_link_with_settings' Dropbox api from vb .net for windows desktop app

My code saves 'the body of the response' into the var: sJSON however, my code crashes before it gets to the line which reads that response. In this case, the one who is throwing the exception is the vb.net compiler.

I don't know if it could be useful but analyzing the information included into the vb.net exception I found this:

Headers = {Transfer-Encoding: chunked  Connection: keep-alive  X-Dropbox-Request-Id: baad501b308ddd5c1310f7af856563fe  Content-Type: text/plain; charset=utf-8  Date: Wed, 16 Mar 2016 19:02:33 GMT  Server: nginx    }

StatusCode = BadRequest {400}
StatusDescription = "Bad Request"