In Realm on android im getting "Field already exists" error but its on a fresh install?

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ok. so i delete my app completely from android. Then on a fresh install i get the error

Field already exists in 'PortfolioCoin': color. 

Why is realm trying to migrate on a fresh install?

I got this in my application file

    Realm.init(this);
    RealmConfiguration configuration = new RealmConfiguration.Builder()
            .name(Realm.DEFAULT_REALM_NAME)
            .schemaVersion(1)
            .migration(new Migration())
            //.deleteRealmIfMigrationNeeded()
            .build();
    Realm.setDefaultConfiguration(configuration);

    Realm.compactRealm(configuration);

and this is my migration file

public class Migration implements RealmMigration {

@Override
public void migrate(final DynamicRealm realm, long oldVersion, long newVersion) {
    // During a migration, a DynamicRealm is exposed. A DynamicRealm is an untyped variant of a normal Realm, but
    // with the same object creation and query capabilities.
    // A DynamicRealm uses Strings instead of Class references because the Classes might not even exist or have been
    // renamed.

    // Access the Realm schema in order to create, modify or delete classes and their fields.
    RealmSchema schema = realm.getSchema();


    if (oldVersion == 0) {

        RealmObjectSchema portfolioCoinSchema = schema.get("PortfolioCoin");
        portfolioCoinSchema
                .addField("color", int.class)
                .addField("totalValueBTC", double.class);

        oldVersion++;
    }

}

}

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