What is the TypeLoadException from Reflection?

I have the following code:

    public static IEnumerable<MethodInfo> FindStaticMethods<T>()
    { 
        var M =
            from Assemblies in AppDomain.CurrentDomain.GetAssemblies().AsParallel()
            from Types in Assemblies.GetTypes()
            from Methods in Types.GetRuntimeMethods()
            where Methods.IsStatic
            let Attributes = Methods.GetCustomAttributes(typeof(T), true)
            where Attributes?.Length > 0
            select Methods;

        var L = M.ToList();

        return L;
    }

and I get the following error:

System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.ViewFeatures, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Could not load file or assembly 'Microsoft.AspNetCore.Mvc.Core, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) at System.Reflection.RuntimeModule.GetTypes() at System.Reflection.Assembly.GetTypes() ...

I don't understand this error, can anyone explain?