java.lang.NoSuchMethodException Java

I'm trying to call 2 different versions of the same dependency library (jars) within a top level Main class. So I created an interface with 2 implementation classes, one will use v1.jar and the other will use v2.jar by explicitly calling ClassLoader.

public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, InstantiationException, IllegalAccessException {

    ClassLoader loader1 = new URLClassLoader( new URL[] { new File("/Users/haddad/.m2/repository/com/company/somejar-1.0.0-SNAPSHOT.jar").toURL() });
    ClassLoader loader2 = new URLClassLoader( new URL[] { new File("/Users/haddad/.m2/repository/com/company/somejar-2.0.0-SNAPSHOT.jar").toURL() });

    Class<?> c1 = loader1.loadClass("com.engine.na.EngineV1");
    Class<?> c2 = loader2.loadClass("com.engine.na.EngineV2");

    IEngine app1 = (IEngine) c1.newInstance();
    IEngine app2 = (IEngine) c2.newInstance();

    app1.run();
    app2.run();
}

Here are EngineV1 and V2 with Interface:

public Interface IEngine {
    void run();
}

public class EngineV1 implements IEngine {
    public static void main(String[] args) {
        new EngineV1().run();
    }

    public void run() {
        // some logic...
    }
}

public class EngineV2 implements IEngine {
    public static void main(String[] args) {
        new EngineV2().run();
    }

    public void run() {
        // some logic...
    }
}

When I go to run this class I get:

Exception in thread "main" java.lang.InstantiationException: com.engine.na.EngineV1
    at java.lang.Class.newInstance(Class.java:427)
    at com.engine.na.MainClass.main(MainClass.java:23)
Caused by: java.lang.NoSuchMethodException: com.engine.na.EngineV1.<init>()
    at java.lang.Class.getConstructor0(Class.java:3082)
    at java.lang.Class.newInstance(Class.java:412)
    ... 1 more

Why do I get this error? How to solve for this?