Key is missing from snippet

Hi I added this code to my web site html body (end of body)
    <!-- Start of  Zendesk Widget script -->
    <script id="ze-snippet" src="https://static.zdassets.com/ekr/snippet.js?key=MyKey"> </script>
    <!-- End of  Zendesk Widget script -->
the chat is not been displayed and i keep getting error

Key is missing from snippet vendors~rollbar.noconflict.umd.min.js:1:58963
    n https://static.zdassets.com/ekr/vendors~rollbar.noconflict.umd.min.js:1
    oe http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    (Async: setTimeout handler)
    _immediateFn http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    l http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    s http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    d http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    re http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    (Async: promise callback)
    re http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    d http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    u http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    re http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    oe http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    <anonymous> http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    (Async: setTimeout handler)
    _immediateFn http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    l http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    f http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    (Async: setTimeout handler)
    _immediateFn http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    l http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    f http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    (Async: setTimeout handler)
    _immediateFn http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    c http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    then http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    <anonymous> http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    <anonymous> http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    o http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    <anonymous> http://static.zdassets.com/ekr/snippet.js?key=MyKey:1
    <anonymous> http://static.zdassets.com/ekr/snippet.js?key=MyKey:1

How Can I fix it? what did I do wrong?