big man

how do i run it in MelonDS?

Every time I try to open pkhex I'm greeted with an error message saying: System.TypeLoadException: Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. at System.ModuleHandle.ResolveMethod(RuntimeModule module, Int32 methodToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount) at System.ModuleHandle.ResolveMethodHandleInternalCore(RuntimeModule module, Int32 methodToken, IntPtr[] typeInstantiationContext, Int32 typeInstCount, IntPtr[] methodInstantiationContext, Int32 methodInstCount) at System.ModuleHandle.ResolveMethodHandleInternal(RuntimeModule module, Int32 methodToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext) at System.Reflection.CustomAttributeData..ctor(RuntimeModule scope, CustomAttributeRecord caRecord) at System.Reflection.CustomAttributeData.GetCustomAttributes(RuntimeModule module, Int32 tkTarget) at System.Reflection.CustomAttributeData.GetCustomAttributesInternal(RuntimeAssembly target) at System.Resources.ManifestBasedResourceGroveler.GetNeutralResourcesLanguage(Assembly a, UltimateResourceFallbackLocation& fallbackLocation) at System.Resources.ResourceManager.CommonSatelliteAssemblyInit() at System.Resources.ResourceManager..ctor(String baseName, Assembly assembly) at PKHeX.WinForms.Properties.Resources.get_ResourceManager() at PKHeX.WinForms.SplashScreen.InitializeComponent() at PKHeX.WinForms.Program.Main() System.TypeLoadException: Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. at System.ModuleHandle.ResolveMethod(RuntimeModule module, Int32 methodToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount) at System.ModuleHandle.ResolveMethodHandleInternalCore(RuntimeModule module, Int32 methodToken, IntPtr[] typeInstantiationContext, Int32 typeInstCount, IntPtr[] methodInstantiationContext, Int32 methodInstCount) at System.ModuleHandle.ResolveMethodHandleInternal(RuntimeModule module, Int32 methodToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext) at System.Reflection.CustomAttributeData..ctor(RuntimeModule scope, CustomAttributeRecord caRecord) at System.Reflection.CustomAttributeData.GetCustomAttributes(RuntimeModule module, Int32 tkTarget) at System.Reflection.CustomAttributeData.GetCustomAttributesInternal(RuntimeAssembly target) at System.Resources.ManifestBasedResourceGroveler.GetNeutralResourcesLanguage(Assembly a, UltimateResourceFallbackLocation& fallbackLocation) at System.Resources.ResourceManager.CommonSatelliteAssemblyInit() at System.Resources.ResourceManager..ctor(String baseName, Assembly assembly) at PKHeX.WinForms.Properties.Resources.get_ResourceManager() at PKHeX.WinForms.Properties.Resources.get_Icon() at PKHeX.WinForms.ErrorWindow.InitializeComponent() at PKHeX.WinForms.ErrorWindow..ctor(String lang) at PKHeX.WinForms.ErrorWindow.ShowErrorDialog(String friendlyMessage, Exception ex, Boolean allowContinue) at PKHeX.WinForms.Program.CurrentDomain_UnhandledException(Object sender, UnhandledExceptionEventArgs e) and I am the least bit tech savvy, so I don't know what this means. Any advise would be helpful.