Invalid UDID String


When I hit the run button in Android Studio, I get an error that says Invalid UDID string ‘’. I’m copying the full error message below. Any help would be appreciated.

/Users/cjj/AndroidStudioProjects/HelloWorld_MultiOS/gradlew moeLaunch -Pmoe.launcher.options=no-build,no-install-on-target,config:Debug -Pmoe.launcher.simulators=
Using already downloaded SDK: /Users/cjj/.moe/moe-sdk-1.4.2
Using already downloaded SDK: /Users/cjj/.moe/moe-sdk-1.4.2
:ios:moeLaunchInvalid UDID string ‘’.

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
1 actionable task: 1 executed
Command failed: [/Users/cjj/.moe/moe-sdk-1.4.2/tools/simlauncher, --udid=, --app-path=/Users/cjj/AndroidStudioProjects/HelloWorld_MultiOS/ios/build/moe/xcodebuild/Debug-iphonesimulator/, --launch-arg=-args]

FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ‘:ios:moeLaunch’.

Process exited with non-zero exit value

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

  • Get more help at


Edit the run configuration, make sure you select a valid simulator from the list.

Sorry I’m a bit of a newbie. What configuration file are you referring to? Where should it be located?

Nevermind. Should have finished reading the instructions for the Hello World app.