Fix Error: Use JsonReader.setLenient(true) for Malformed JSON

First Check your server response is valid JSON or Not if not make it proper

To check the resposne you can add loggingInterceptor for OkHttpClient

OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(new LoggingInterceptor()).build();

static class LoggingInterceptor implements Interceptor {
@Override
public Response intercept(Interceptor.Chain chain) throws IOException {
Request request = chain.request();

long t1 = System.nanoTime();
Log.v("Request ",String.format("Sending request %s on %s%n%s",
request.url(), chain.connection(), request.headers()));

Response response = chain.proceed(request);

long t2 = System.nanoTime();
Log.v("Request ",String.format("Received response for %s in %.1fms%n%s",
response.request().url(), (t2 - t1) / 1e6d, response.headers()));

final String responseString = new String(response.body().bytes());

Log.v("Request ","Response: " + responseString);

return response.newBuilder()
.body(ResponseBody.create(response.body().contentType(), responseString))
.build();
}}

If every thing fine add GsonConverter with below code

GsonBuilder gsonBuilder=new GsonBuilder();
gsonBuilder.setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES);
gsonBuilder.setLenient();

Finally Retrofit object creation should be like below

Retrofit.Builder()
        .addConverterFactory(GsonConverterFactory.create(gsonBuilder.create()))
      .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .baseUrl(ApiCall.BASE_IRL)
        .client(client)
        .build();

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