Using suspend in interface retrofit2 error : No JsonAdapter for retrofit2.Call

[reizamv]

error happen when using suspend

@POST("permohonanUjiLab")
 suspend fun postpermohonanuji(@Body task: Reqpengajuanlab?): Call<responsepengajuanlab>

but it working if suspend remove

@POST("permohonanUjiLab")
 fun postpermohonanuji(@Body task: Reqpengajuanlab?): Call<responsepengajuanlab>

[JakeWharton]

For suspend fun usage, you can drop Call from the return type and only specify the body type.

So in your example:

@POST("permohonanUjiLab")
suspend fun postpermohonanuji(@Body task: Reqpengajuanlab?): responsepengajuanlab

The use of suspend is the execution mechanism and replaces Call, in the same way using something like RxJava's Single would replace Call.