How to test REST services using Advancd Rest client?

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REST

I developed REST service to insert the data in database and this is my code :

[OperationContract]
      [WebInvoke(UriTemplate = "Comp", Method = "POST", RequestFormat = WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Xml)]
      void CreateCompany(Company company);

I implemented that CreateCompany() method.
My endpoint address is "http://localhost:8732/Design_Time_Addresses/RESTAppointments/Service1/ed"

and in advanced rest client I am sending this input

<CreateCompany>
<CompanyName>Kamineni</CompanyName>
<AppointmentStartTime>10</AppointmentStartTime>
<AppointmentEndTime>19</AppointmentEndTime>
<BreakStartTime>14</BreakStartTime>
<BreakEndTime>15</BreakEndTime>
<Interval>15</Interval>
</CreateCompany>

URL I am giving is:http://localhost:8732/Design_Time_Addresses/RESTAppointments/Service1/Comp[^]


Now I want to test it using Advanced REST client in the browser .However when I make a request Iam getting error:
400 Bad Request :Response doesnot contain any data

Where Am I going wrong ?How to test it to insert data ?

Thanks,,