How To Fix Layout Error on Blogger

Hi all,

I'm having problems with the elements tab of the blogger layout interface.
I cannot change elements' place with the usual drap n' drop method as before.
When I try saving after doing so a BX error code comes up every time and changes arent implemented.

I'm guessing this is because the code of my template lacks some closing tags or something like that
Or maybe have I streched the side and main columns to much ?

I don't know and I've tried all I could think of (it's not much cause I really new to the blogging world)

Please help if you know how or have this same problem
Many Thanks

you should backup your template before you change/edit it, at least choose new template is the one problem solve