Unity error -> crashing while build & run

I have a big problem, yesterday building did work without problems and today (I didn't change anything) it crashes with a few errors when I try to build it (iOS -> Xcode) I just started with unity few day's ago, so I'm not that familiar with it.

I tried already: - Update Unity - Different Folder for Building - Not Build&Run just Build - Restart Unity - Reimport Assets

Errors:

1. Failed running /Applications/Unity/Unity.app/Contents/il2cpp/build/UnityLinker.exe -out="/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed/tempStrip" -x="/Applications/Unity/PlaybackEngines/iOSSupport/Whitelists/Core.xml" -x "/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed/../platform_native_link.xml" -x "/var/folders/b2/f9vh9ycd6zdfz8lbv0hndyk40000gn/T/tmp7a5f694.tmp" -x "/var/folders/b2/f9vh9ycd6zdfz8lbv0hndyk40000gn/T/tmp7570b08c.tmp" -x "/var/folders/b2/f9vh9ycd6zdfz8lbv0hndyk40000gn/T/tmp55821346.tmp" -d "/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed" -a "/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed/Assembly-CSharp.dll" -a "/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed/UnityEngine.UI.dll" -a "/Users/sp8iky/TowerDefense/Temp/StagingArea/Data/Managed/UnityEngine.Analytics.dll" --dotnetruntime=il2cpp --dotnetprofile=legacyunity --use-editor-options

stdout: Fatal error in Unity CIL Linker Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'ClassLibrary1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' at Unity.Linker.Steps.AddUnresolvedStubsStep.GetTypeModule (Mono.Cecil.TypeReference type, Mono.Cecil.AssemblyDefinition[] assemblies) [0x00047] in :0 at Unity.Linker.Steps.AddUnresolvedStubsStep.MarkAssemblyOfType (Unity.Linker.UnityLinkContext context, Mono.Cecil.TypeReference type) [0x0000e] in :0 at Unity.Linker.Steps.UnityMarkStep.HandleUnresolvedType (Mono.Cecil.TypeReference reference) [0x00001] in :0 at Mono.Linker.Steps.MarkStep.MarkType (Mono.Cecil.TypeReference reference) [0x0004a] in :0 at Mono.Linker.Steps.MarkStep.MarkGenericArguments (Mono.Cecil.IGenericInstance instance) [0x0001b] in :0 at Mono.Linker.Steps.MarkStep.GetOriginalType (Mono.Cecil.TypeReference type) [0x00014] in :0 at Mono.Linker.Steps.MarkStep.MarkType (Mono.Cecil.TypeReference reference) [0x0000e] in :0 at Mono.Linker.Steps.MarkStep.MarkField (Mono.Cecil.FieldReference reference) [0x00058] in :0 at Unity.Linker.Steps.UnityMarkStep.MarkFields (Mono.Cecil.TypeDefinition type) [0x0001c] in :0 at Unity.Linker.Steps.UnityMarkStep.DoAdditionalTypeProcessing (Mono.Cecil.TypeDefinition type) [0x00248] in :0 at Mono.Linker.Steps.MarkStep.MarkType (Mono.Cecil.TypeReference reference) [0x001e0] in :0 at Mono.Linker.Steps.MarkStep.MarkType (Mono.Cecil.TypeReference reference) [0x00098] in :0 at Mono.Linker.Steps.MarkStep.InitializeType (Mono.Cecil.TypeDefinition type) [0x00064] in :0 at Mono.Linker.Steps.MarkStep.InitializeType (Mono.Cecil.TypeDefinition type) [0x00027] in :0 at Mono.Linker.Steps.MarkStep.InitializeAssembly (Mono.Cecil.AssemblyDefinition assembly) [0x00035] in :0 at Mono.Linker.Steps.MarkStep.Initialize () [0x00019] in :0 at Mono.Linker.Steps.MarkStep.Process (Mono.Linker.LinkContext context) [0x00008] in :0 at Unity.Linker.Steps.UnityMarkStep.Process (Mono.Linker.LinkContext context) [0x0000c] in :0 at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x00021] in :0 at Unity.Linker.UnityDriver.Run () [0x00087] in :0 at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling () [0x00007] in :0 at Unity.Linker.UnityDriver.RunDriver () [0x00002] in :0 stderr:

UnityEngine.Debug:LogError(Object) UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:128) UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:73) UnityEditorInternal.AssemblyStripper:RunAssemblyLinker(IEnumerable`1, String&, String&, String, String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:91) UnityEditorInternal.AssemblyStripper:StripAssembliesTo(String[], String[], String, String, String&, String&, String, IIl2CppPlatformProvider, IEnumerable`1, BuildTargetGroup) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:84) UnityEditorInternal.AssemblyStripper:RunAssemblyStripper(IEnumerable, String, String[], String[], String, IIl2CppPlatformProvider, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:215) UnityEditorInternal.AssemblyStripper:StripAssemblies(String, IIl2CppPlatformProvider, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:115) UnityEditorInternal.IL2CPPBuilder:Run() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:170) UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:35) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

1. Exception: /Applications/Unity/Unity.app/Contents/il2cpp/build/UnityLinker.exe did not run properly! UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:130) UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1 setupStartInfo) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:73) UnityEditorInternal.AssemblyStripper.RunAssemblyLinker (IEnumerable`1 args, System.String& out, System.String& err, System.String linkerPath, System.String workingDirectory) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:91) UnityEditorInternal.AssemblyStripper.StripAssembliesTo (System.String[] assemblies, System.String[] searchDirs, System.String outputFolder, System.String workingDirectory, System.String& output, System.String& error, System.String linkerPath, IIl2CppPlatformProvider platformProvider, IEnumerable`1 additionalBlacklist, BuildTargetGroup buildTargetGroup) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:84) UnityEditorInternal.AssemblyStripper.RunAssemblyStripper (IEnumerable assemblies, System.String managedAssemblyFolderPath, System.String[] assembliesToStrip, System.String[] searchDirs, System.String monoLinkerPath, IIl2CppPlatformProvider platformProvider, UnityEditor.RuntimeClassRegistry rcr) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:215) UnityEditorInternal.AssemblyStripper.StripAssemblies (System.String managedAssemblyFolderPath, IIl2CppPlatformProvider platformProvider, UnityEditor.RuntimeClassRegistry rcr) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:115) UnityEditorInternal.IL2CPPBuilder.Run () (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:170) UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, System.Action`1 modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:35) UnityEditor.iOS.PostProcessiPhonePlayer.CrossCompileManagedDlls (BuildSettings bs, UnityEditor.iOS.ProjectPaths paths, UnityEditor.AssemblyReferenceChecker checker, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport buildReport) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/BuildPostProcessor.cs:825) UnityEditor.iOS.PostProcessiPhonePlayer.PostProcess (BuildSettings bs, UnityEditor.iOS.ProjectPaths paths, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport buildReport) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/BuildPostProcessor.cs:660) UnityEditor.iOS.PostProcessiPhonePlayer.PostProcess (PostProcessorSettings postProcessorSettings, BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/BuildPostProcessor.cs:611) UnityEditor.iOS.iOSBuildPostprocessor.PostProcess (BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/iPhonePlayer/Extensions/Common/ExtensionModule.cs:37) UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Modules/DefaultBuildPostprocessor.cs:27) UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTargetGroup targetGroup, BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:287) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

2. Build completed with a result of 'Failed' UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

3. UnityEditor.BuildPlayerWindow+BuildMethodException: 4 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:187 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindowBuildMethods.cs:94 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)