Undefined symbols for architecture i386: "_SCNetworkReachabilitySetCallback"
found it!i have copied the SystemConfiguration.framework into my project folder (checking the box when i added from xcode).deleting that folder in my project now compiles well
After adding SystemConfiguration.framework from build phases my project compiles well...
have a fun...!
I had also the same problem. I added some frameworks directly with dragging and dropping them.
To resolve it, I deleted all of them and added them through the menu Target>Build Phases and then again added all needed frameworks through Link Binary With Libraries.
After this, your code should be working fine again.