Installation Failed "Invalid Argument" When Trying to Run Today Application Extension

Installation Failed: Invalid Argument -iOS Extension

After 2 days of research I have found the answer which I believe is an xcode bug.

Basically this is caused by having different build name on your XCode build settings. Making them uniform should solve the problem. As shown here https://devforums.apple.com/message/1047770#1047770

I hope this helps anyone stumbled upon this question.

Installation Failed: Invalid Argument after moving to Xcode 7

This happens because "Upgrade to recommended settings" will change the info.plist's CFBundleIdentifier to point to $(PRODUCT_BUNDLE_IDENTIFIER) instead of the old $(BUNDLE_IDENTIFIER).

Apple says in the Xcode 7 release notes that PRODUCT_BUNDLE_IDENTIFIER is now "the recommended place to set the Bundle Identifier for a target." So if you're using BUNDLE_IDENTIFIER anyplace else in your project, you have to change it to PRODUCT_BUNDLE_IDENTIFIER to keep things in sync.

Unable to run app in Simulator: An error was encountered while running (Domain = LaunchServicesError, Code = 0)

This has now been resolved. The problem was caused by ShareKit library added by CocoaPods for compatibility reasons. After removing the library and all related code, the app successfully launched in simulator. I recommend checking the system log for more details on the issue as to me it pointed me in the right direction (stating the name of conflicting library).

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