XCode - Could not support development

Hi all,

I have two iphones, one is running 3.0 OS, another one is running 3.0.1 OS. I followed the advisory note at: http://adcdownload.apple.com/iphone/iphonesdk_3.0__final/iphone_os_3.0.1advisory.pdf and created a symbolic link under the /Developer directory like this:

adminde-macbook:DeviceSupport admin$ pwd
/Developer/Platforms/iPhoneOS.platform/DeviceSupport
adminde-macbook:DeviceSupport admin$ ls -l
total 40
lrwxr-xr-x 1 root admin 11 Jun 17 14:14 2.0 (5A345) -> 2.0 (5A347)
drwxrwxr-x 5 root admin 170 Jun 17 14:14 2.0 (5A347)
lrwxr-xr-x 1 root admin 11 Jun 17 14:14 2.0.1 (5B108) -> 2.0 (5A347)
lrwxr-xr-x 1 root admin 11 Jun 17 14:14 2.0.2 (5C1) -> 2.0 (5A347)
drwxrwxr-x 5 root admin 170 Jun 17 14:14 2.1
lrwxr-xr-x 1 root admin 3 Jun 17 14:14 2.1.1 -> 2.1
drwxrwxr-x 5 root admin 170 Jun 17 14:14 2.2
drwxrwxr-x 5 root admin 170 Jun 17 14:14 2.2.1
drwxrwxr-x 5 root admin 170 Aug 17 15:04 3.0 (7A341)
lrwxr-xr-x 1 admin admin 64 Aug 17 15:08 3.0.1 -> /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0 (7A341)
adminde-macbook:DeviceSupport admin$

but I still get the message "Could not support development" in my X-Code organizer page. Can anyone tell me what I should do to continue my development on OS 3.0.1?
I can compile and execute any code perfectly on the iPhone running OS 3.0 and I am sure that my provision profile is not expired.
Thank you very much for your help.

Best regards,
wonghang.