This message is often a red herring. It usually means "oops, I have found an error on your page". It may actually have NOTHING to do with editable or non-editable regions, and may in fact even refer to a CSS error rather than an HTML error.
The first stop is the validator - does this page validate?
I did run validator and fixed a few obvious errors but a few left over - will try and fix them all and see if that clears it --- thanks for your reply
Problem Fixed. On further investigation we found that the following was our problem. Resolv
As for your issue - there are two problems on your template:
1. You have jquery includes in a non-ediatble region in the page head tags, please move them in an editable area named "head" inside the head tags as otherwise, when DW checks these files and they are not editable you get these errors.
2. You have not turned off the "automatic file update" option in Bootstrap 3 options: Tools > Commands Bootstrap 3 Options.