Headspace2 settings do not work

I installed Headspace 2 but when I go to settings, I can not edit them. If I click on a setting topic like Global Settings, nothing happens.

IE gives this error:
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; InfoPath.2; .NET CLR 3.0.30618)
Timestamp: Tue, 12 May 2009 11:10:15 UTC

Message: Object doesn’t support this property or method
Line: 521
Char: 2
Code: 0
URI: https://www.lahjaopas.fi/wp-admin/options-general.php?page=headspace.php

Any help will be much appreciated.