android - com.parse.ParseRequest$ParseRequestException: bad json response

I am using Parse with Heroku in my application. But I am getting the error, com.parse.ParseRequest$ParseRequestException: bad json response.

i did a lot of research, and found that some people had problem in the format of the server(url), where they needed to add / after /parse. But I have the correct format of the URL written in the code.

This is my code below:

  Parse.initialize(new 
  Parse.Configuration.Builder(getApplicationContext())
            .applicationId("APP_ID")
            .clientKey(null)
            .server("https://abc-xyz.herokuapp.com/parse/").build()
  );

  ParseObject gameScore = new ParseObject("GameScore");
  gameScore.put("score", 1337);
  gameScore.put("playerName", "Sean Plott");
  gameScore.put("cheatMode", false);
  gameScore.saveInBackground(new SaveCallback() {
      public void done(ParseException e) {
          if (e == null) {  // the error is always 'bad JSON response' here
              Log.i("Parse", "Save Succeeded");
          } else {
              Log.i("Parse", "Save Failed");
          }
      }
  });

Also, just to give you another update,

I am getting the same error. I was using compile 'com.parse:parse-android:1.13.0', but I changed it to compile 'com.parse:parse-android:1.12.0', therefore, it gives 'cannot resolve symbol' on server(url).build().

Also, if I am using, compile 'com.parse:parse-android:1.10.0', I am getting the same error, i.e., 'cannot resolve symbol' on Configuration, in the above code.

This is my build.gradle file:

apply plugin: 'com.android.application'

android {
    compileSdkVersion rootProject.ext.compileSdkVersion

    defaultConfig {
        applicationId "com.parse.starter"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    buildToolsVersion '25.0.0'
}

dependencies {
    compile 'com.android.support:appcompat-v7:22.2.0'

    compile 'com.parse.bolts:bolts-tasks:1.4.0'
    compile 'com.parse:parse-android:1.13.0'
}

Can somebody provide some solution for this.

Thanks in advance.