Failed when using with Ninja.

[hyalpha]

When I excute the code xcbuild -executor ninja [-workspace Example.xcworkspace ...] in command line, it failed.Any suggestion would be great appreciated!

warning: unhandled Compiler key SupportedLanguageVersions warning: unhandled ProductType key IsUnitTest warning: unhandled ProductType key IsUITest warning: unhandled ProductType key IsUnitTest warning: unhandled ProductType key IsUnitTest warning: unhandled ProductType key IsUITest warning: unhandled ProductType key IsUnitTest error: cannot find base BuildSystem specification 'embedded-shared:com.apple.buildsettings.standard' error: cannot find base ProductType specification 'embedded-shared:com.apple.product-type.framework' error: cannot find base ProductType specification 'embedded-shared:com.apple.product-type.xpc-service' error: cannot find base ProductType specification 'embedded:com.apple.product-type.pluginkit-plugin' error: cannot find base BuildSystem specification 'embedded:com.apple.build-system.core' error: cannot find base BuildSystem specification 'embedded:com.apple.build-system.native' error: cannot find base Linker specification 'embedded:com.apple.pbx.linkers.ld' error: cannot find base ProductType specification 'embedded-simulator:com.apple.product-type.pluginkit-plugin' warning: unhandled PlatformVersion key BuildAliasOf warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled PlatformVersion key BuildAliasOf warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled PlatformVersion key BuildAliasOf warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled PlatformVersion key BuildAliasOf warning: unhandled PlatformVersion key BuildAliasOf warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled Product key BuildID warning: unhandled Architecture key DeploymentTargetRange warning: unhandled Architecture key DeploymentTargetRange warning: unhandled Architecture key DeploymentTargetRange warning: unhandled ProductType key IsUnitTest warning: unhandled ProductType key IsUITest warning: unhandled ProductType key IsUnitTest error: cannot find base ProductType specification 'iphoneos-shared:com.apple.product-type.application' error: cannot find base ProductType specification 'iphoneos-shared:com.apple.product-type.app-extension' error: cannot find base ProductType specification 'iphoneos-shared:com.apple.product-type.app-extension' error: cannot find base BuildSystem specification 'embedded:com.apple.build-system.native' error: cannot find base ProductType specification 'appletvos-shared:com.apple.product-type.app-extension' error: cannot find base ProductType specification 'appletvos-shared:com.apple.product-type.app-extension' error: cannot find base ProductType specification 'watchos-shared:com.apple.product-type.application' error: cannot find base ProductType specification 'watchos-shared:com.apple.product-type.app-extension' error: cannot find base ProductType specification 'watchos-shared:com.apple.product-type.app-extension' error: cannot find base ProductType specification 'watchos-shared:com.apple.product-type.app-extension' error: cannot find base Compiler specification 'embedded:com.apple.compilers.llvm.clang.1_0.compiler' error: cannot find base Compiler specification 'embedded:com.apple.xcode.tools.swift.compiler' error: cannot find base Linker specification 'embedded:com.apple.pbx.linkers.ld' error: cannot find base Compiler specification 'embedded:com.apple.xcode.tools.swift.compiler' error: cannot find base Linker specification 'embedded:com.apple.pbx.linkers.ld' error: cannot find base BuildSystem specification 'macosx:com.apple.buildsettings.standard' Generating Ninja files... warning: object version 48 may be unsupported warning: object version 48 may be unsupported unable to find executable: builtin-infoPlistUtility error: failed to build target ninja error: failed to generate build.ninja