Error when using Generic with Class?> parameter

Got some problem when using Generic with Enum:

enum MyEnum1 {
    // ...
    public static MyEnum fromString(String enumStr) { /* ... */ }
}

enum MyEnum2 {
    // ...
    public static MyEnum fromString(String enumStr) { /* ... */ }
}

enum MyEnum3 {
    // ...
    public static MyEnum fromString(String enumStr) { /* ... */ }
}

class MyClass {
    Map<Class<? extends Enum<?>, EnumSet<? extends Enum<?>>> map;

    public <E extends Enum<E>> void addValue2EnumSet(Class<E> enumType, E value)；

    // enumType and valueStr is of the same length
    public static Map<Class<? extends Enum<?>, EnumSet<? extends Enum<?>>> getMapOfEnumSet(Class<? extends Enum<?>>[] enumTypes, String[] valueStrs) {
        for (int i = 0; i < enumTypes.length; ++i) {
            // for each enumType and valueStr pair
            // add the value from valueStr to the Map
            Class<? extends Enum<?>> enumType = enumTypes[i];
            String valueStr = valueStrs[i];
            MyClass c = // ...
            Method fromStringMethod = enumType.getDeclaredMethod("fromString", String.class);
            c.addValue2EnumSet(enumType, enumType.cast(fromStringMethod.invoke(null, valueStr))); // error!
        }
        return c.map;
    }
}

In this line c.addValue2EnumSet(enumType, enumType(fromStringMethod.invoke(null, valueStr)));, an compile-error is the second parameter, Found: 'java.lang.Enum<?>, required: '? extends java.lang.Enum'`

How to call addValue2EnumSet() in getEnumSetOf()?

In this case, a Class<? extends Enum<?> enumType parameter is passed, and it is used to judge which kind of Enum (Enum1/2/3) is the target, then call the fromString() method to generate the corresponding Enum instance. I have no idea but the reflection to get methods from the enumType.