Default.aspx, code behind, and designer tree structure not correct

Hello, Using VS 2012 and .NET 4.0.

Normally, the tree structure for Default.aspx is like this

Default.aspx
   Default.aspx.designer.vb
   Default.aspx.vb

somehow a project got changed to look like this

Default.aspx
   Default.aspx.vb
      Default.aspx.designer.vb

Also, I am getting a runtime error that it cannot find the designer Class.

How can this be corrected?

Thanks for any ideas