Help uploading a cookbook to Chef

I am very new to chef and would like someones assistance in uploading a cookbook to chef. The cookbook exists on my machine but when i try to execute this command in powershell (run as admin): knife cookbook upload learn_chef_iis
I get the following message -

ERROR: The object you are looking for could not be found

<meta http-equiv="Content-Type" content="text/html; char <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE <title>Chef - 404 Not Found</title> <link media="all" rel="stylesheet" type="text/css" href= <link rel="stylesheet" type="text/css"

404 - Not Found

Sorry, I can't find what you are looking for.

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