If the problem is related to the content that you have added then you should be able to edit the problem content and have it work again. If you are not able to identify the content that is causing the problem you may need to redo it. You should be able to find the content in your db in the pcms_contents table. In here you should be able to see the page and area name and the content for it. You will want to erase the content that you see for the offending page to have it go back to normal.