iMIS - Error to Edit a Content Page

I was getting the error

Exception information: 
Exception type: ArgumentOutOfRangeException 
Exception message: 
Parameter name: contentItemKey Actual value was 00000000-0000-0000-0000-000000000000. at Asi.Business.ContentManagement.ContentItemCollection.get_Item(Guid contentItemKey) at AsiCommon_Controls_ContentManagement_WebPartLayout.WebPartManager_WebPartMoved(Object sender, WebPartEventArgs e) at AsiCommon_Controls_ContentManagement_WebPartLayout.Page_Load(Object sender, EventArgs e)



This was because the Layout.

If you go to Rise >> Manage Layout
Check others layout and see if those are the same style that you have in your page.

In my case I had tables(td and tr) instead of divs. I put div and it works.