Build Failed - validate build/release

Just a few days ago I could both run (in the simulator and on my iphone device) and package my iOS app for the iOS iTunes Store. But now I cannot get past this error during package:

[ERROR] :  ** BUILD FAILED **
[ERROR] :  The following build commands failed:
[ERROR] :   Validate build/Release-iphoneos/Trivia\ Rain.app
[ERROR] :  (1 failure)
TRACE  | titanium exited with exit code 1
ERROR  | Error: ti run exited with error code 1
    at ChildProcess.<anonymous> (/Users/natej/.appcelerator/install/4.1.2/package/node_modules/appc-cli-titanium/plugins/run.js:84:66)
    at ChildProcess.emit (events.js:117:20)
    at Process.ChildProcess._handle.onexit (child_process.js:810:12)

Since a few days ago when the package worked perfectly, I have changed nothing related to my keychains, keystore, profiles, certificates, etc. I have made a few code changes, but after my changes, the app compiled fine, runs in simulator, and deploys/runs on my iphone 6 device. I have double checked that my certs and distribution profiles are all valid, and nothing has changed from a few days ago.

I have cleaned my project, restarted Appcelerator Studio, restarted my mac. Still I cannot get past this error.

Any ideas?