Yeah, I tried to make sure that I called out that it is "possibly caused by" and it tries to be as specific about when the error will occur as possible so that a user can make an informed decision. @ahpook also wanted to updated what the link pointed to to maybe include a lot more information about what is going on (right now it is just the deprecate yaml issue in redmine).

I also think that given how tight the regex is, it /should/ only be triggered in the right circumstance. I can only think of a seriously hosed master (such as the installed from multiple different packaging systems problem that we see sometimes) having this problem when it isn't this issue. Those, of course, are famous last words :)