Ios CircleCi Build Error

Hi,
why

Error in build,Else everything is fine.

set -o pipefail && xcodebuild -workspace ‘CircleCi.xcworkspace’ -scheme ‘CircleCi’ clean build test -sdk iphonesimulator -destination ‘platform=iOS Simulator,name=iPhone 6,OS=latest’ CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= PROVISIONING_PROFILE= | tee $CIRCLE_ARTIFACTS/xcode_raw.log | xcpretty --color --report junit --output $CIRCLE_TEST_REPORTS/xcode/results.xml