Blog desk error during the uploading posts

Hello there,
I am currently unable to post to Word Press via Blog desk. My Internet connection is working just fine so is not a network problem. Does any of you experts can help me please to fix this error ? Why I have this kind of error ?
Thank you !

BlogDesk
An error occurred while uploading the post.
Error transferring the post to the server.
HTTP-Errorcode: 406
NONE ACCEPTABLE – No responses acceptable to the client were found.
