When I imported an asset to unity then I try to run the game this message appeared :
allowed per platform. Assembly paths: C:/Users/ELEMENT14/MyGameIdea/Library/PackageCache/com.unity.ads@2.0.8/Editor/UnityEditor.Advertisements.dll, Assets/2D Top Down Shooter/2D Top Down Shooter/Library/PackageCache/com.unity.ads@2.0.8/Editor/UnityEditor.Advertisements.dll
UnityEditor.Scripting.ScriptCompilation.EditorBuildRules.CreateTargetAssemblies (System.Collections.Generic.IEnumerable1[T] customScriptAssemblies, System.Collections.Generic.IEnumerable1[T] precompiledAssemblies) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorBuildRules.cs:251)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.UpdateCustomTargetAssemblies () (at
C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:636)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.SetAllCustomScriptAssemblyJsons (System.String[] paths) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:746)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.SetAllCustomScriptAssemblyJsons (System.String[] allAssemblyJsons) (at C:/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:217)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
My Unity version is 2018.4.11