I'm switching from another blog system to wordpress 2.6.3. When trying to import my old posts via RSS file, I get a few successful entries then the error: Importing post...Couldn't get post ID. When I remove the offending entry and retry the import, it proceeds for a bit, then errors out again. This happened with 10 of the 85 entries. What should I look for in the offending entries to get them to import?