Publishing desktop calendar to Mobile Me : error message

Question

Hi, I have been trying to publish a calendar created by ICal which is in my "On my Mac" folder and not in " XXXX Mac"to my Mobile Me account. These are all the messages I am getting, but I can't figure out what the problem is.
FYI, I am using OS X 10.6.8, and ICal version 4.0.4. I have also NOT yet moved from Mobile Me to Cloud (could this be the problem??).
Here are the steps I have taken :
in ICal, selected calendar I want  >> Publish
>>>> Publish Calendar as "xxxxx"
>>>> Publish on : MOBILE ME..... OK
Then I get this error message :
** Your MobileMe account configuration is not correct"... Your MobileMe subscription information is not correct.... To configure your subscription, use MobileMe preferences ***
In MobileMe preferences :
Account : access ok (ID ok, password ok)
Sync : Automatic (OK).... If I select "sync" now my computer correctly syncs with MobileMe.
Idisk : all OK
Back to my mac : OFF
Back to ICal :
Preferences >>> Accounts .... the "accounts" page is empty, so i select *+* to create a new CalDAV account
Account type : MobileMe / Automatic (I have tried both options, I get the same error message : see below)
Email & password : OK
Message : Searching for calendar accounts for the email address you provided...
>>> Configuring CalDAV account
>>> Error Message : "the account information was not found.The server has not specified a calendar home for the account at "/--https://cal.me.com/".
I keep selecting the the option "Create" and keep getting the same error message.
*** CAN ANYONE EXPLAIN TO ME WHAT THIS LAST ERROR MESSAGE MEANS, AND HOW I CAN RESOLVE IT?
FIY, The regular sync between my computer and MobileMe works fine ; the problem I am having is publishing this "external" calendar.
Thank you very much for your help,

Answer 1

Re MobileMe
I was going to uninstall but a little wary, on your advice I took the plunge and hey presto it worked.
Many many thanks b noir it was driving me crazy.