no codesigning certificates found

From the "Known issues" of https://developer.apple.com/support/certificates/expiration/:

"in the Keychain Access application, select the System keychain. Select 'Show Expired Certificates' in the View menu and then delete the expired version of the Apple Worldwide Developer Relations Certificate Authority Intermediate certificate."

and then install the new Apple Worldwide Developer Relations Certificate from apple from here

https://developer.apple.com/support/certificates/expiration/
Even if you have installed the new certificate, you have to delete the expired one from the System keychain.

CodeSign error: a valid provisioning profile is required

"CodeSign error: a valid provisioning profile is required for product type 'Application' in SDK 'Device - iPhone OS 2.2"

This error will appear when you update your provisioning profile in iPhone SDK 2.2
or after the expiration of developer certificate and that you have a new provisioning profile from the developer portal

This is the solution (which is modified from http://www.furmanek.net/54/iphone-sdk-22-codesign-error/)

Suppose you have copied your provisioning profile called "iPhone_Development.mobileprovision" to the Library folder and build & go an old iPhone project called "MyApp", and this annoying error appears

(1) cd ~/Library/MobileDevice/Provisioning\ Profiles/

(2) find out the UUID of the provisioning profile
strings iPhone_Development.mobileprovision | grep "<string>.*-.*</string>"

output is like this
<string>xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx</string>

(3) copy that UUID between the string tag

(4) close xcode and go to your project
cd ~/Projects/MyApp/MyApp.xcodeproj

(5) Use a text editor to open the project.pbxproj
find the string PROVISIONING_PROFILE

paste the UUID that you copied from step (3) and put it in both Debug and Release Sections (do multiple finds) for the following line
e.g.
PROVISIONING_PROFILE = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";

(6) Launch XCode and open the project and build & go again


Updates :
Deleting all of the lines "PROVISIONING_PROFILE" in project.pbxproj will also fix the problem for iPhone SDK 3 or above