Reflection. Executing non-static method with parameters

I need to execute some method via reflection

method to execute

public void someMethod(int value1, int value2, String str, int value3)
{
    try
    {
        // some code
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

This is execution code

public static void execute()
{
    try
    {
        String          className = "some.class";
        String          classPath = "some.pack.name" + ":" + "some.class";
        PathClassLoader loader    = new dalvik.system.PathClassLoader(classPath, ClassLoader.getSystemClassLoader());

        Class           clazz     = Class.forName(className, true, loader);
        Method          method    = clazz.getDeclaredMethod("someMethod", Integer.class, Integer.class, String.class, Integer.class); 
        Object          object    = clazz.newInstance();

        method.invoke(object, 1, 2, "str", 3);
    }
    catch (Throwable e) {e.printStackTrace();}
}

But I gets error

01-22 21:44:52.286: W/System.err(10877): java.lang.NoSuchMethodException: someMethod [class java.lang.Integer, class java.lang.Integer, class java.lang.String, class java.lang.Integer]
01-22 21:44:52.286: W/System.err(10877):    at java.lang.Class.getConstructorOrMethod(Class.java:472)
01-22 21:44:52.286: W/System.err(10877):    at java.lang.Class.getDeclaredMethod(Class.java:640)

What I'm doing wrong?