json error using Workdrive API

json error using Workdrive API

I get this error:

{"errors":[{"id":"F000","title":"JSON_PARSE_ERROR"}]}

Running this code

parameters = Map();
parameters.put("parent_id","hu1rqabb159824ad8406eb64e8af38c01dfba");
parameters.put("name", "this is the name of the file");

response = invokeurl
[
type :POST
parameters:parameters
connection:"workdrive_all"
];

The connnection is correct.
The hardwired parent folder ID exists.

Where is my syntax incorrect?