Could not load file or assembly System.Runtime.CompilerServices.Unsafe

[chucklu]

System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at System.ReadOnlySpan1..ctor(T[] array, Int32 start, Int32 length) at SabberStoneCore.Model.Zones.Zone1.GetSpan()
at SabberStoneCore.Model.Entities.Controller.Options(Boolean skipPrePhase)
at SabberStoneCoreGui.Nodes.OptionNode.Options(ConcurrentDictionary`2& optionNodes) in C:\repository\GitHub\HearthSim\SabberStone\SabberStoneGui\src\Nodes\OptionNode.cs:line 113
at SabberStoneGui.MainWindow.<>c__DisplayClass4_2.<worker_DoWork>b__5() in C:\repository\GitHub\HearthSim\SabberStone\SabberStoneGui\src\MainWindow.xaml.cs:line 82
at System.Threading.Tasks.Task.InnerInvoke()
at System.Threading.Tasks.Task.Execute()

=== Pre-bind state information ===
LOG: DisplayName = System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
(Fully-specified)
LOG: Appbase = file:///C:/repository/GitHub/HearthSim/SabberStone/SabberStoneGui/bin/Debug/
LOG: Initial PrivatePath = NULL
Calling assembly : System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51.

LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\repository\GitHub\HearthSim\SabberStone\SabberStoneGui\bin\Debug\SabberStoneGui.exe.Config
LOG: Using host configuration file:
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Post-policy reference: System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: Attempting download of new URL file:///C:/repository/GitHub/HearthSim/SabberStone/SabberStoneGui/bin/Debug/System.Runtime.CompilerServices.Unsafe.DLL.
LOG: Attempting download of new URL file:///C:/repository/GitHub/HearthSim/SabberStone/SabberStoneGui/bin/Debug/System.Runtime.CompilerServices.Unsafe/System.Runtime.CompilerServices.Unsafe.DLL.
LOG: Attempting download of new URL file:///C:/repository/GitHub/HearthSim/SabberStone/SabberStoneGui/bin/Debug/System.Runtime.CompilerServices.Unsafe.EXE.
LOG: Attempting download of new URL file:///C:/repository/GitHub/HearthSim/SabberStone/SabberStoneGui/bin/Debug/System.Runtime.CompilerServices.Unsafe/System.Runtime.CompilerServices.Unsafe.EXE.

[chucklu]

The gui crashed when I try to start a new game
C:\repository\GitHub\HearthSim\SabberStone\SabberStoneCore\src\Model\Zones\Zone.cs

public ReadOnlySpan<T> GetSpan()
		{
			return new ReadOnlySpan<T>(_entities, 0, _count);
		}

[chucklu]

It can be fixed by reference System.Runtime.CompilerServices.Unsafe from NuGet for SabberStoneGui project.

[chucklu]

By the way, I also found you have a no span build option,

I have tried to build no span, but build failed.

1>------ Build started: Project: SabberStoneCore, Configuration: NoSpan Any CPU ------
1>C:\Program Files\dotnet\sdk\3.0.100-preview-010184\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(151,5): message NETSDK1057: You are using a preview version of .NET Core. See: https://aka.ms/dotnet-core-preview
1>src\CardSets\Standard\TrollCardsGen.cs(30,7,30,34): warning CS0105: The using directive for 'SabberStoneCore.Model.Zones' appeared previously in this namespace
1>src\Auras\SummoningPortalAura.cs(85,23,85,30): warning CS0108: 'SummoningPortalAura.DeApply(IPlayable)' hides inherited member 'Aura.DeApply(IPlayable)'. Use the new keyword if hiding was intended.
1>src\Loader\TargetingPredicates.cs(120,36,120,61): error CS0029: Cannot implicitly convert type 'SabberStoneCore.Model.Zones.ReadOnlySpan<SabberStoneCore.Model.Entities.IPlayable>' to 'System.ReadOnlySpan<SabberStoneCore.Model.Entities.IPlayable>'
1>src\Loader\TargetingPredicates.cs(227,32,227,53): error CS0029: Cannot implicitly convert type 'SabberStoneCore.Model.Zones.ReadOnlySpan<SabberStoneCore.Model.Entities.Minion>' to 'System.ReadOnlySpan<SabberStoneCore.Model.Entities.Minion>'
1>src\Tasks\ComplexTasks.cs(459,5,459,28): error CS0104: 'ReadOnlySpan<>' is an ambiguous reference between 'SabberStoneCore.Model.Zones.ReadOnlySpan' and 'System.ReadOnlySpan'
1>src\Loader\CardLoader.cs(110,39,110,84): warning CS0618: 'Enum.ToString(IFormatProvider)' is obsolete: 'The provider argument is not used. Please use ToString().'
1>src\Model\Zones\Zone.cs(192,15,192,30): error CS1729: 'ReadOnlySpan' does not contain a constructor that takes 3 arguments
1>src\CardSets\Standard\TrollCardsGen.cs(805,16,805,42): warning CS0618: 'AdaptiveCostEffectObsolete' is obsolete: 'Not used any more'
1>src\CardSets\Standard\TrollCardsGen.cs(1180,6,1180,12): error CS0246: The type or namespace name 'Random' could not be found (are you missing a using directive or an assembly reference?)
1>src\CardSets\Standard\TrollCardsGen.cs(1855,25,1855,29): error CS0103: The name 'Math' does not exist in the current context
1>src\CardSets\Standard\TrollCardsGen.cs(1860,24,1860,28): error CS0103: The name 'Math' does not exist in the current context
1>src\CardSets\LootapaloozaCardsGen.cs(2789,16,2789,42): warning CS0618: 'AdaptiveCostEffectObsolete' is obsolete: 'Not used any more'
1>src\CardSets\IcecrownCardsGen.cs(2906,16,2906,42): warning CS0618: 'AdaptiveCostEffectObsolete' is obsolete: 'Not used any more'
1>src\Tasks\SimpleTasks\IncludeTask.cs(263,39,263,46): error CS1061: 'ReadOnlySpan' does not contain a definition for 'ToArray' and no accessible extension method 'ToArray' accepting a first argument of type 'ReadOnlySpan' could be found (are you missing a using directive or an assembly reference?)
1>Done building project "SabberStoneCore.csproj" -- FAILED.
2>------ Build started: Project: SabberStoneGui, Configuration: NoSpan Any CPU ------
2> SabberStoneGui -> C:\repository\GitHub\HearthSim\SabberStone\SabberStoneGui\bin\NoSpan\SabberStoneGui.exe
========== Build: 1 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========