Application launch did not return a valid pid nor a launch error

My app installs fine on the simulator and I can attach the process after opening it manually but it won't run from the debug play button without throwing the error below.

I've tried all the tricks I know (deleting the derived data and re-compiling, commenting out some code here and there, exhaustive searches for keywords).

Any help or insight would be greatly appreciated.

Details

Application launch for '------' did not return a valid pid nor a launch error.
Domain: NSPOSIXErrorDomain
Code: 3
Failure Reason: No such process
User Info: {
    IDERunOperationFailingWorker = IDELaunchiPhoneSimulatorLauncher;
}
--

Analytics Event: com.apple.dt.IDERunOperationWorkerFinished : {
    "device_model" = "iPhone14,2";
    "device_osBuild" = "15.0 (19A339)";
    "device_platform" = "com.apple.platform.iphonesimulator";
    "launchSession_schemeCommand" = Run;
    "launchSession_state" = 1;
    "launchSession_targetArch" = "x86_64";
    "operation_duration_ms" = 845;
    "operation_errorCode" = 3;
    "operation_errorDomain" = NSPOSIXErrorDomain;
    "operation_errorWorker" = IDELaunchiPhoneSimulatorLauncher;
    "operation_name" = IDERunOperationWorkerGroup;
    "param_consoleMode" = 0;
    "param_debugger_attachToExtensions" = 0;
    "param_debugger_attachToXPC" = 1;
    "param_debugger_type" = 3;
    "param_destination_isProxy" = 0;
    "param_destination_platform" = "com.apple.platform.iphonesimulator";
    "param_diag_MainThreadChecker_stopOnIssue" = 0;
    "param_diag_MallocStackLogging_enableDuringAttach" = 0;
    "param_diag_MallocStackLogging_enableForXPC" = 1;
    "param_diag_allowLocationSimulation" = 1;
    "param_diag_gpu_frameCapture_enable" = 0;
    "param_diag_gpu_shaderValidation_enable" = 0;
    "param_diag_gpu_validation_enable" = 0;
    "param_diag_memoryGraphOnResourceException" = 0;
    "param_diag_queueDebugging_enable" = 1;
    "param_diag_runtimeProfile_generate" = 0;
    "param_diag_sanitizer_asan_enable" = 0;
    "param_diag_sanitizer_tsan_enable" = 0;
    "param_diag_sanitizer_tsan_stopOnIssue" = 0;
    "param_diag_sanitizer_ubsan_stopOnIssue" = 0;
    "param_diag_showNonLocalizedStrings" = 0;
    "param_diag_viewDebugging_enabled" = 1;
    "param_diag_viewDebugging_insertDylibOnLaunch" = 1;
    "param_install_style" = 0;
    "param_launcher_UID" = 2;
    "param_launcher_allowDeviceSensorReplayData" = 0;
    "param_launcher_kind" = 0;
    "param_launcher_style" = 0;
    "param_launcher_substyle" = 0;
    "param_runnable_appExtensionHostRunMode" = 0;
    "param_runnable_productType" = "com.apple.product-type.application";
    "param_runnable_swiftVersion" = "5.5.1";
    "param_runnable_type" = 2;
    "param_testing_launchedForTesting" = 0;
    "param_testing_suppressSimulatorApp" = 0;
    "param_testing_usingCLI" = 0;
    "sdk_canonicalName" = "iphonesimulator15.0";
    "sdk_osVersion" = "15.0";
    "sdk_variant" = iphonesimulator;
}
--


System Information

macOS Version 11.6.1 (Build 20G224)
Xcode 13.1 (19466) (Build 13A1030d)
Timestamp: 2021-11-18T16:14:15-07:00

Solution 1:

Ok turns out this mystery no-name Environment Variable was checked in the scheme. I unchecked it and it worked.