Il2cpp.exe did not run properly! when build Android app

Exception: D:\Program Files\unity-5.6\Editor\Data\il2cpp/build/il2cpp.exe did not run properly!
at UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action1 setupStartInfo) [0x00170] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\BuildUtils.cs:98 at UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List1 arguments, System.Action1 setupStartInfo, System.String workingDirectory) [0x0004a] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\Il2Cpp\IL2CPPUtils.cs:313 at UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (ICollection1 userAssemblies, System.String outputDirectory, System.String workingDirectory) [0x001f2] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\Il2Cpp\IL2CPPUtils.cs:304
at UnityEditorInternal.IL2CPPBuilder.Run () [0x00093] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\Il2Cpp\IL2CPPUtils.cs:151
at UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, System.Action`1 modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry, Boolean debugBuild) [0x00010] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\Il2Cpp\IL2CPPUtils.cs:34
at UnityEditor.Android.PostProcessor.Tasks.RunIl2Cpp.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) [0x00000] in :0
at UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) [0x00000] in :0
at UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry) [0x00000] in :0
at UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (BuildPostProcessArgs args) [0x00000] in :0
at UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTargetGroup targetGroup, BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.BuildReporting.BuildReport report) [0x000d7] in C:\buildslave\unity\build\Editor\Mono\BuildPipeline\PostprocessBuildPlayer.cs:186
UnityEditor.BuildPipeline:BuildPlayerInternalNoCheck(String, String, String, BuildTargetGroup, BuildTarget, BuildOptions, Boolean)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions, Boolean) (at C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindow.cs:485)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions) (at C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindow.cs:339)
UnityEditor.BuildPlayerWindow:GUIBuildButtons(IBuildWindowExtension, Boolean, Boolean, Boolean, BuildPlatform) (at C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindow.cs:1390)
UnityEditor.BuildPlayerWindow:ShowBuildTargetSettings() (at C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindow.cs:1317)
UnityEditor.BuildPlayerWindow:OnGUI() (at C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindow.cs:913)
System.Reflection.MonoMethod:InternalInvoke(Object, Object, Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object, CultureInfo) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView:Invoke(String, Object) (at C:\buildslave\unity\build\Editor\Mono\HostView.cs:262)
UnityEditor.HostView:Invoke(String) (at C:\buildslave\unity\build\Editor\Mono\HostView.cs:255)
UnityEditor.HostView:OnGUI() (at C:\buildslave\unity\build\Editor\Mono\HostView.cs:84)

Facing the same error, but no solution yet. I have two app ready, but cannot publish in play store.

problem fixed here : il2cpp.exe did not run properly - YouTube

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If you encounter the error message “il2cpp.exe did not run properly” while building an Android app, it suggests that there was an issue with the execution of the il2cpp.exe process, which is responsible for converting C# code to C++ during the build process.
To resolve this, you can try restarting the build process, ensuring that all necessary dependencies and configurations are properly set up, and checking for any conflicting or outdated libraries or plugins that may be causing the problemcantalou guide

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  1. Make sure that you have the latest version of Unity. The Il2Cpp compiler is updated regularly, so it’s important to make sure that you have the latest version of Unity to avoid compatibility issues.

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