Unable to start a visit

02-27 16:34:59.246 24304-26540/org.openmrs.mobile D/OkHttp: <-- 400 Bad Request https://demo.openmrs.org/openmrs/ws/rest/v1/visit (951ms)
02-27 16:34:59.246 24304-26540/org.openmrs.mobile D/OkHttp: {"error":{"message":"Invalid Submission","code":"webservices.rest.error.invalid.submission","globalErrors":[],"fieldErrors":{"visitType":[{"code":"Visit.error.visitType.required","message":"Visit Type is required"}]}}}