Build log:
/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -workspace /Users/donnywals/Projects/apple-spike-core-data-helpers/PersistentStore.xcodeproj/project.xcworkspace -scheme PersistentStore -configuration Debug -IDECustomDerivedDataLocation=/Users/donnywals/Library/Developer/Xcode/DerivedData SYMROOT=/Users/donnywals/Library/Developer/Xcode/DerivedData/PersistentStore-eveisykprmnxhkbpwnknbrjujruv/Build/Products OBJROOT=/Users/donnywals/Library/Developer/Xcode/DerivedData/PersistentStore-eveisykprmnxhkbpwnknbrjujruv/Build/Intermediates.noindex -destination arch=x86_64 -destination-timeout 15 TEST_AFTER_BUILD=NO build
User defaults from command line:
IDECustomDerivedDataLocation = /Users/donnywals/Library/Developer/Xcode/DerivedData
Build settings from command line:
OBJROOT = /Users/donnywals/Library/Developer/Xcode/DerivedData/PersistentStore-eveisykprmnxhkbpwnknbrjujruv/Build/Intermediates.noindex
SYMROOT = /Users/donnywals/Library/Developer/Xcode/DerivedData/PersistentStore-eveisykprmnxhkbpwnknbrjujruv/Build/Products
TEST_AFTER_BUILD = NO
note: Using new build system
2018-11-29 18:15:07.892 xcodebuild[7607:1452617] unable to create build operation: Error Domain=com.apple.xcbuild Code=1 "unknown error while handling message: missingTarget(guid: "a5c38197c13d97243771e5c951980089c88eb38cbe54dbd3739afd02c7eafdcb")" UserInfo={NSLocalizedDescription=unknown error while handling message: missingTarget(guid: "a5c38197c13d97243771e5c951980089c88eb38cbe54dbd3739afd02c7eafdcb")}
** BUILD FAILED **
Verify final result code for completed build operation
Build operation failed without specifying any errors. Individual build tasks may have failed for unknown reasons.
One possible cause is if there are too many (possibly zombie) processes; in this case, rebooting may fix the problem.
Some individual build task failures (up to 12) may be listed below.