Iphoto cannot be opened because of problem

Question

i have ilife 11 and just upgraded to lion.  iphoto wasn't working when I had snow leopard either, this problem just started.  the error that i get say..."check with the developer to make sure iphoto works with this version of mac os x.  you may need to reinstall the app.  be ure to install any available updates for the app and mac os x. 
i did check for updates btw and restarted. 
let me know if you can help please.
thanks

Answer 1

To re-install iPhoto
1. Put the iPhoto.app in the trash (Drag it from your Applications Folder to the trash)
2a: On 10.5:  Go to HD/Library/Receipts and remove any pkg file there with iPhoto in the name.
2b: On 10.6: Those receipts may be found as follows:  In the Finder use the Go menu and select Go To Folder. In the resulting window type
/var/db/receipts/
2c: on 10.7 they're at
/private/var/db/receipts
A Finder Window will open at that location and you can remove the iPhoto pkg files.
3. Re-install.
If you purchased an iLife Disk, then iPhoto is on it.
If iPhoto was installed on your Mac when you go it then it’s on the System Restore disks that came with your Mac. Insert the first one and opt to ‘Install Bundled Applications Only.
If you purchased it on the App Store you can find it in your Purchases List.