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this bx error code came up when trying to update one's blog template

*A Blogger.com employee has said that when some of these bx error codes have to do with adding a new template, sometimes the template itself has some error in its html coding which means that Blogger.com can't accept it.

What do you do in such a case?

Well you'll have to go over the html coding of the template that you want to add and make sure that the html coding is correct and that it doesn't have any missing closing tags or any missing html coding.

If the html coding isn't completely correct then it won't be accepted as your new Blogger.com template