Unfortunately this is a private/company repo, so I can't just give you a URL, but here is some relevant info. The tail of the revmap looks like this:
58779 7dfb4fcec11e3ddad05294d57776be82d7ba346e emoticons
58780 218211fd4ef19290b7015968160230f074a8736f release-1.6
58786 327d8c072e94f13489ed1ae2aaa4be66584d00b2 emoticons
58801 4e01d021f9fc5dce5092bf8ce0fb747bf63e36fe release-1.6
The error says: abort: unknown revision '327d8c072e94f13489ed1ae2aaa4be66584d00b2'!
This is confusing to me because clearly the revision is listed in the revmap. The commit is on the 'emoticons' branch, so I don't understand "what's wrong", so to speak.
In case it's relevant, the last thing I did before this was using "hg svn genignore". This seemed to work fine, although it took a 'long time' (about a minute, I'd estimate). Pulls before then had worked fine (although it'd been a while). There are no local/outgoing changes.
If there's any commands I can run to diagnose this issue further, I'd be happy to - I am by all means no expert on hg or hgsubversion, and I apologize in advance if some basic/crucial info is lacking - I'm not sure what you need!