Cannot save or apply changes in News Show Pro 1, 3 and 4

Hello,
I'm having problems with modules "News Show Pro" 1, 3 and 4. I have tried them all and all of them show me the very same problem when I need to save the changes made on the configurations of the modules (Extensions -> Module manager -> News Show GK3, for example). When I want to apply changes, or save them, or even close the configuration page, nothing works. The browser (IE, or Mozilla, or even Opera) shows me an error:

'document.adminForm.task' is Null or not an Object
Line: 323
Character: 3
Code: 0
URI: http://localhost/joomla_luiz/includes/j ... ascript.js]

I cannot change the module's position, title and nothing else. Also, the other configuration options is not showing, as you see in the attached image.

Can someone help me?