Push how?
Who exactly outputs that error when?
How did you build the project? (Do you have the complete build output?)
Did this exact project work before upgrading to Xcode 10?

Project was opened in Xcode 10, built then Distributed from the Xcode10 organiser, the project worked fine with Xcode 9 without any changes. i dont have build output as i have to use Xcode to build

Right now we only have workaround for builds with the CLI published over at #407. You might need some instructions on how to get a Xcode only project to work. Someone will have to look into this.

Yes, i have just built with CLI and it built and ran in simulator but i need to distribute to the app store and cant without Xcode, so cant put anything onto test flight.

I was going to try and use the CLI and create the app store package and use application loader ive tried

cordova build ios --buildFlag="-UseModernBuildSystem=0" --packageType="app-store"

but i only get the normal .app file in the emulator folder which application loader will not deal with

Try cordova build ios --release --device --buildFlag="-UseModernBuildSystem=0" --packageType="app-store"

Facing the same issue.

ionic cordova build ios --buildFlag="-UseModernBuildSystem=0" allows you to make the build. However not able to submit it to the store. It gives the same error as @neofuture mentioned

cordova build ios --release --device
Discovered plugin "call-number" in config.xml. Adding it to the project
Plugin "mx.ferreyra.callnumber" already installed on android.
Plugin "mx.ferreyra.callnumber" already installed on ios.
Building project: /Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/DriveIt.xcworkspace
Configuration: Release
Platform: device
User defaults from command line:
IDEArchivePathOverride = /Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/DriveIt.xcarchive

Build settings from command line:
CONFIGURATION_BUILD_DIR = /Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/build/device
SHARED_PRECOMPS_DIR = /Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/build/sharedpch

Build settings from configuration file '/Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/cordova/build-release.xcconfig':
CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES = YES
CODE_SIGN_ENTITLEMENTS = $(PROJEC{T}_{D}IR)/$(PROJECT_NAME)/Entitlements-$(CONFIGURATION).plist
CODE_SIGN_IDENTITY = iPhone Distribution
ENABLE_BITCODE = NO
FRAMEWORK_SEARCH_PATHS = $(inherited)"${PODS_ROOT}/FirebaseAnalytics/Frameworks" "${PODS_ROOT}/FirebaseCore/Frameworks" "${PODS_ROOT}/FirebaseInstanceID/Frameworks" "${PODS_ROOT}/FirebaseMessaging/Frameworks"
GCC_PREPROCESSOR_DEFINITIONS = $(inherited)COCOAPODS=1$(inherited) GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1 $(inherited) PB_FIELD_32BIT=1 PB_NO_PACKED_STRUCTS=1
HEADER_SEARCH_PATHS = $(inherited)"${PODS_ROOT}/Headers/Public" "${PODS_ROOT}/Headers/Public/FirebaseAnalytics" "${PODS_ROOT}/Headers/Public/FirebaseCore" "${PODS_ROOT}/Headers/Public/FirebaseInstanceID" "${PODS_ROOT}/Headers/Public/FirebaseMessaging" "${PODS_ROOT}/Headers/Public/GoogleToolboxForMac" "${PODS_ROOT}/Headers/Public/Protobuf" "${PODS_ROOT}/Headers/Public/nanopb"
LIBRARY_SEARCH_PATHS = $(inherited)"${PODS_CONFIGURATION_BUILD_DIR}/GoogleToolboxForMac" "${PODS_CONFIGURATION_BUILD_DIR}/Protobuf" "${PODS_CONFIGURATION_BUILD_DIR}/nanopb"
OTHER_CFLAGS = $(inherited)-isystem"${PODS_ROOT}/Headers/Public" -isystem "${PODS_ROOT}/Headers/Public/FirebaseAnalytics" -isystem "${PODS_ROOT}/Headers/Public/FirebaseCore" -isystem "${PODS_ROOT}/Headers/Public/FirebaseInstanceID" -isystem "${PODS_ROOT}/Headers/Public/FirebaseMessaging" -isystem "${PODS_ROOT}/Headers/Public/GoogleToolboxForMac" -isystem "${PODS_ROOT}/Headers/Public/Protobuf" -isystem "${PODS_ROOT}/Headers/Public/nanopb"
OTHER_LDFLAGS = $(inherited) -ObjC -l"GoogleToolboxForMac" -l"Protobuf" -l"c++" -l"nanopb" -l"sqlite3" -l"z" -framework "AddressBook" -framework "FirebaseAnalytics" -framework "FirebaseCore" -framework "FirebaseCoreDiagnostics" -framework "FirebaseInstanceID" -framework "FirebaseMessaging" -framework "FirebaseNanoPB" -framework "StoreKit" -framework "SystemConfiguration"
PODS_BUILD_DIR = ${BUILD_DIR}
PODS_CONFIGURATION_BUILD_DIR = $POD{S}_{B}UIL{D}_{D}IR/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)
PODS_PODFILE_DIR_PATH = ${SRCROOT}/.
PODS_ROOT = ${SRCROOT}/Pods
SWIFT_OBJC_BRIDGING_HEADER = $(PROJEC{T}_{D}IR)/$(PROJECT_NAME)/Bridging-Header.h

error: archive not found at path '/Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/DriveIt.xcarchive'
** EXPORT FAILED **

(node:17836) UnhandledPromiseRejectionWarning: Error code 65 for command: xcodebuild with args: -exportArchive,-archivePath,DriveIt.xcarchive,-exportOptionsPlist,/Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/exportOptions.plist,-exportPath,/Users/muhammadsufian/Documents/GITREPOS/driveit/userApp/platforms/ios/build/device
(node:17836) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:17836) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

@dpogue even this does not solve the signing issue

That created the IPA fine, but... application loader can not connect to the app store anymore so thats that one scuppered, i can see a lot of frustration from todays Xcode 10 auto update as no one will now be able to publish there app

Temporary Fix: I went back to Xcode 9.4.1 from he developer downloads at developer.apple.com, reopened the project with this and was able to upload to the app store.

For notice: I was previously building the project with Xcode Beta (i like the black theme) and was using Xcode 9 for uploading to app store. i have no problems building in Xcode 10 my only issue is distribution to the app store.

I used fastlane deliver today for uploading two apps build with Xcode 10 without problems. The only thing that needed to be changed so the signing was working was to change the ProvisioningStyle to Manual in all project.pbxproj files. Then you can set your codeSignIdentity and provisioningProfile via your build.json.

sh.sed(
    '-i',
    /ProvisioningStyle = Automatic/,
    'ProvisioningStyle = Manual',
    'platforms/ios/**/project.pbxproj'
  );

@neofuture i was able to submit app via xcode but now instead of wildcard i had to create an individual provisioning profile for each app. However after that everything worked as expected.