c# Fix wcf

There a service client . It can't be modified
I want to create a wcf service for it
I tried and I get an error
I don't know how to fix it
I want to fix this problem
remotely anydesk


<Message>The content-type application/json has been sent to a service expecting text/xml; charset=utf-8. There may be a mismatch in the client and service documentation.</Message><StackTrace> عند System.ServiceModel.Channels.HttpInput.ThrowHttpProtocolException(String message, HttpStatusCode statusCode, String statusDescription)
عند System.ServiceModel.Channels.HttpInput.ValidateContentType()

<Message>The message with action '' could not be processed at the recipient, due to a ContractFilter mismatch at EndpointDispatcher. This could be due to a contract mismatch (actions don't match between sender and receiver) or an authentication/security mismatch between sender and receiver. Verify that the sender and receiver have the same contract and documentation (including security requirements, such as message, transport, none).</Message>
<StackTrace> عند System.ServiceModel.Dispatcher.ErrorBehavior.ThrowAndCatch(Exception e, Message message)
عند System.ServiceModel.Dispatcher.ChannelHandler.ReplyFailure(RequestContext request, Message fault, String action, String reason, FaultCode code)