Ionic Emulate iOS/Android command not working

Question

Context: I am currently on Ionic version 3.15.2. The 'ionic serve' command works. The 'ionic cordova emulate ios' and 'ionic cordova emulate android' do not work. I have tried deleting/reinstalling certain packages and dependencies from Ionic but nothing has helped. I have a feeling I need to delete/reinstall Xcode all together but I figured I would ask for help here first. This is the error message I get on my terminal when I try to use the Ionic simulator/emulator:

Command /usr/bin/codesign failed with exit code 1

** BUILD FAILED **

The following build commands failed:

CodeSign build/emulator/****app.app

(1 failure)

Error: Error code 65 for command: xcodebuild with args: -xcconfig,/Users/*****/Desktop/*****/platforms/ios/cordova/build-debug.xcconfig,-workspace,****app.xcworkspace,-scheme,****app,-configuration,Debug,-sdk,iphonesimulator,-destination,platform=iOS Simulator,name=iPhone 5s,build,CONFIGURATION_BUILD_DIR=/Users/*****/Desktop/****/platforms/ios/build/emulator,SHARED_PRECOMPS_DIR=/Users/****/Desktop/****/platforms/ios/build/sharedpch [ERROR] An error occurred while running cordova emulate ios (exit code 1).

Note: I used the asterisks in place of the path for privacy reasons

It's weird that ionic serve works but the other two commands don't...

Answer 1

Even ionic info should fail with the latter error.

It's because of the module @ionic/cli-plugin-proxy. As soon as I uninstalled it I could successfully run ionic info. But it detected IONIC_HTTP_PROXY in my environment and asked me to install it again.
So I did manually later, but the error returned. So I installed the missing module using npm install -g @ionic/cli-framework. After that I could successfully run ionic info again. Therefor I guess it's an unresolved dependency issue inside the @ionic/cli-plugin-proxy module.