Error Fiji / ImageJ: Unable to load plugin (ins)

If you want to load a new plugin and appear a message like this: 

One possible solution is to add default constructors (without parameters) to the classes. If you create only the constructors with parameters, the default constructor is no present and ImageJ (Fiji) cannot run the plugin and the programm shows this error.

Source: http://stackoverflow.com/questions/10784867/imagej-unable-to-load-plugins