I´m building a webpage at the domain coachingportalen.no. The problem is that I have the Neuro theme, but I want to change it to the responsive theme by ThemeID. When I go to theme settings and activate the Responsive theme, the theme is changed but the frontpage is just getting an 404 error. When I try to go to theme options and do something, nothing is working on the frontpage, because the only thing that is showing there is the 404 error.
Any help or advices will be deeply appreciated.