ParameterizedType proguard runtime error

[mgpx]

My code works in debug mode (not proguard)

My code

public static <U> ResponseServer<U> generateJSON(String json, Class<U> dataClass){
        ResponseServer<U> responseServer = null;
        if (dataClass == JUnidade.class)
           responseServer = (ResponseServer<U>)LoganSquare.parse(json, new ParameterizedType<ResponseServer<JUnidade>>() { }); 
....

my rules of proguard-rules.pro

-keep class com.mypackage.myapp.WebService.Models.ResponseServer.**

-keep class * extends com.bluelinelabs.logansquare.ParameterizedType.**

-keepclassmembers class com.mypackage.myapp.WebService.Models.** {*;}

-keep public class com.mypackage.myapp.WebService.Models.** {
     public static <fields>;
}

Decompiled in debug mode (not run proguard) It's Work

Decompiled in release mode (run proguard) don't work

any suggestion?

My question in stackoverflow