401 Unauthorized : Missing required argument node I am trying to Create Services to Create Node Type Discussion in a Group using Services Module, but getting the error : 401 Unauthorized : Missing required argument node
In the Header I have given:

Content-type:application/json
x-csrf-token:token value
session-name:session name value

In the Body I have given :
{
&quot;og_group_ref&quot;: {&quot;und&quot;: [{&quot;target_id&quot;: &quot;3897&quot;}]},

&quot;title&quot;: &quot;Title of discussion&quot;,

&quot;field_description&quot;: {&quot;und&quot;: [{&quot;value&quot;: &quot;test description&quot;}]},

&quot;type&quot;: &quot;discussion&quot;,

}

Can anyone please tell me why I am getting this error ?
You put comma on last parameter "type": "discussion", that doesn't required at the end. javascript, jquery, json doesn't allow comma at end of array. It returns invalid argument.