Can't import iCal into Google Calendar; help?

I've been trying to import some iCal calendars into Google recently, and I keep getting notices that "Calendar is not available. Please try again in a few minutes." The problem is that I've been trying to do this for the past three nights off and on for a few hours while working on other things.

I've done everything right from the iCal end (File-->Export), so I can't figure out what the problem might be. If anyone could try the same thing or let me know what the issue might be, I would really appreciate it.

 

Here's the thing. I've got a few iCal calendars that I've put some time into constructing. I want them uploaded into Google so that they can easily sync with my iPod touch. From there I will subscribe to them using Calaboration. I've done this with one calendar already, but I can't figure out why it's shutting me out on two other calendars. Can only the master calendar on Google have a file imported in to it?