This class indicates an exception likely caused by an API not implemented
correctly. ELKI has some API interface restrictions that cannot be expressed
in the Java language and that are checked at runtime. This in particular
includes parameterization and dynamic binding of algorithms to data.
This exception indicates that such an API might not have been implemented
correctly; you should check the documentation of interfaces you implement for
API descriptions that are not expressible in Java (and thus not checked by
the Java compiler).