How resolved AsciiDoc Error java.lang.Integer cannot be cast to java.util.List

That code take me an error, i try with Spring Boot and Mockito, Junit4:

@Test
public void logout() throws Exception, ApiException {

    //String result = "{\"date\":\"20190212:0000\"}";
    //Mockito.when(controller.logout(any())).thenReturn(result);

    mockMvc.perform(MockMvcRequestBuilders.post(REST_REQUEST_PATH)
            .header("principal", "admin")
            .header("authorization", "authtoken")
            .contentType(MediaType.APPLICATION_JSON)
            .accept("application/json"))
            .andExpect(status().isOk())
            .andDo(document("logout",
                    responseFields(fieldWithPath("date").description("Fecha de entrega de la respuesta.")
                    )));
}