Board Thread:Support Requests - Designing Your Wiki/@comment-20755501-20130926091405/@comment-1158325-20130927084039

Regarding subpage organization, it's up to your personal preference and the policies or established precedent on the wiki. I generally like to use subpages when I have a template that couldn't possibly be useful for any other use. However, if the code you posted is the full text of those templates, it doesn't really seem necessary to have them as separate templates at all.

As for the error, the code in Template:Co should look like, without the equals sign within the braces for uname. You would also need to shift the remaining numbered parameters, since 2 will now be 1 because what used to be 1 is now a named parameter.