Description of problem:

The first time you hit apply after marking or unmarking packages for instalation or removal in 'Add/Remove Programs' the action fails out with an 'unknown error'.  The details are:
Method "InstallPackages" with signature "as" on interface "org.freedesktop.PackageKit.Transaction" doesn't exist


Version-Release number of selected component (if applicable):
PackageKit-0.3.6-2.fc10.i386


How reproducible:


Steps to Reproduce:
1. Clean install of FC10 beta, gnome desktop, apply all updates as of 11:32am EST 10/9/08
2. Open Add/Remove Software
3. In the 'Games' category, select 'apricots'
4. Click 'Apply'
5. A new dialog box will pop up, showing progress...
6. Authenticate when asked
7. A new dialog box will pop up with the error message, close it and the prior progress dialog box.
8. Click 'Apply' again, the progress dialog box will appear, the install will go through cleanly, and you'll be asked if you want to run your new app.  Any further install/uninstall actions will proceed normally as long as you don't restart Add/Remove Software.

Actual results:
First install/uninstall fails, all after proceed normally

Expected results:
First install/uninstall should work without error

Additional info:
Doesn't seem to matter if the first install/uninstall pulls in additional packages for changes, or if you select multiple for the first action.