Issues upgrading to Umbraco 8.14.2

[jonroberts24]

Our client is trying to upgrade the CMS to 8.14.2.
They are saying that they were on 16.3 (which I dont see as a valid version number)
When they upgrade to 8.14.2 and login to the CMS they get the following error:

Is there a step by step upgrade guide that will work when upgrading to 8.14.2?

Server Error in '/' Application.
Boot failed: Umbraco cannot run. See Umbraco's log file for more details.

-> Umbraco.Core.Exceptions.BootFailedException: Boot failed.

-> System.InvalidOperationException: Unable to resolve type: Umbraco.Core.Composing.ComponentCollection, service name:
at LightInject.ServiceContainer.CreateDelegate(Type serviceType, String serviceName, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4748
at LightInject.ServiceContainer.CreateDefaultDelegate(Type serviceType, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4705
at LightInject.ServiceContainer.GetInstance(Type serviceType) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3437
at Umbraco.Core.FactoryExtensions.GetInstance[T](IFactory factory) in D:\a\1\s\src\Umbraco.Core\FactoryExtensions.cs:line 23
at Umbraco.Core.Runtime.CoreRuntime.Boot(IRegister register, DisposableTimer timer) in D:\a\1\s\src\Umbraco.Core\Runtime\CoreRuntime.cs:line 204

-> System.InvalidOperationException: Unable to resolve type: Plumber.Core.Notifications.RemindersComponent, service name:
at LightInject.ServiceContainer.CreateDelegate(Type serviceType, String serviceName, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4748
at LightInject.ServiceContainer.CreateDefaultDelegate(Type serviceType, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4705
at LightInject.ServiceContainer.GetInstance(Type serviceType) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3437
at Umbraco.Core.Composing.ComponentCollectionBuilder.CreateItem(IFactory factory, Type itemType) in D:\a\1\s\src\Umbraco.Core\Composing\ComponentCollectionBuilder.cs:line 33
at System.Linq.Enumerable.WhereSelectArrayIterator2.MoveNext() at System.Linq.Buffer1..ctor(IEnumerable1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)
at Umbraco.Core.Composing.ComponentCollectionBuilder.CreateItems(IFactory factory) in D:\a\1\s\src\Umbraco.Core\Composing\ComponentCollectionBuilder.cs:line 25
at Umbraco.Core.Composing.CollectionBuilderBase3.CreateCollection(IFactory factory) in D:\a\1\s\src\Umbraco.Core\Composing\CollectionBuilderBase.cs:line 120 at LightInject.PerContainerLifetime.GetInstance(Func1 createInstance, Scope scope) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 6169
at LightInject.ServiceContainer.EmitLifetime(ServiceRegistration serviceRegistration, Action1 emitMethod, IEmitter emitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4656 at LightInject.ServiceContainer.<>c__DisplayClass153_0.<CreateEmitMethodWrapper>b__0(IEmitter ms) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3856 at LightInject.ServiceContainer.CreateDynamicMethodDelegate(Action1 serviceEmitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3777
at LightInject.ServiceContainer.CreateDelegate(Type serviceType, String serviceName, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4743

-> System.InvalidOperationException: Unresolved dependency [Target Type: Plumber.Core.Notifications.RemindersComponent], [Parameter: settingsService(Plumber.Core.Services.ISettingsService)], [Requested dependency: ServiceType:Plumber.Core.Services.ISettingsService, ServiceName:]
at LightInject.ServiceContainer.GetEmitMethodForDependency(Dependency dependency) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4207
at LightInject.ServiceContainer.EmitConstructorDependency(IEmitter emitter, Dependency dependency) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4154
at LightInject.ServiceContainer.EmitConstructorDependencies(ConstructionInfo constructionInfo, IEmitter emitter, Action1 decoratorTargetEmitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4120 at LightInject.ServiceContainer.EmitNewInstanceUsingImplementingType(IEmitter emitter, ConstructionInfo constructionInfo, Action1 decoratorTargetEmitMethod) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4081
at LightInject.ServiceContainer.EmitNewInstance(ServiceRegistration serviceRegistration, IEmitter emitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4038
at LightInject.ServiceContainer.CreateDynamicMethodDelegate(Action1 serviceEmitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3777 at LightInject.ServiceContainer.<>c__DisplayClass198_0.<EmitLifetime>b__1() in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4657 at LightInject.PerContainerLifetime.GetInstance(Func1 createInstance, Scope scope) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 6169
at LightInject.ServiceContainer.EmitLifetime(ServiceRegistration serviceRegistration, Action1 emitMethod, IEmitter emitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4656 at LightInject.ServiceContainer.<>c__DisplayClass153_0.<CreateEmitMethodWrapper>b__0(IEmitter ms) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3856 at LightInject.ServiceContainer.CreateDynamicMethodDelegate(Action1 serviceEmitter) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 3777
at LightInject.ServiceContainer.CreateDelegate(Type serviceType, String serviceName, Boolean throwError) in C:\projects\lightinject\src\LightInject\LightInject.cs:line 4743

[nathanwoulfe]

Hey @jonroberts24, v1.6.3 had some issues on more recent V8 releases, they'll need to go to 1.6.5 before upgrading Umbraco, then all should be fine