nopSolutions/nopCommerce · critical · NullReferenceException

Can't get implementation from the scope

Error message

Can't get {nameof(IStoreContext)} implementation from the scope

What it means

Thrown by TaskScheduler.InitializeAsync when scope.ServiceProvider.GetService<IStoreContext>() returns null, as a NullReferenceException with a descriptive message. It is resolved right after IScheduleTaskService, so if you reach this line the service scope works but IStoreContext specifically is not registered/resolvable.

Solutions

1. Check the application log for constructor exceptions from your IStoreContext implementation (GetService returns null on construction failure).
2. Confirm IStoreContext is registered exactly once with a resolvable implementation and all its constructor dependencies are registered.
3. Remove or fix any custom IDependencyRegistrar that re-registers IStoreContext incorrectly.
4. Restore the default store context registration if it was inadvertently removed.

Example fix

// before: a custom registrar overwrites with an unresolvable impl
services.AddTransient<IStoreContext, MyBrokenStoreContext>();
// after: ensure MyBrokenStoreContext ctor deps are registered, or revert:
services.AddScoped<IStoreContext, WebStoreContext>();

using var scope = _serviceScopeFactory.CreateScope();
var ctx = scope.ServiceProvider.GetService<IStoreContext>();
if (ctx is null) { logger.Critical("IStoreContext unresolved; check registrations."); return; }

try { await _taskScheduler.InitializeAsync(); }
catch (NullReferenceException ex) when (ex.Message.Contains(nameof(IStoreContext)))
{ logger.Critical("IStoreContext could not be constructed; inspect ctor deps.", ex); }

When it happens

Trigger: During scheduler init, after tasks load successfully, when the DI container cannot produce IStoreContext. Often caused by a registration extension for the store context failing or a custom IStoreContext implementation whose constructor dependencies cannot be satisfied.

Common situations: Multi-store customization replaces IStoreContext with a custom implementation whose dependencies throw during construction (GetService swallows constructor exceptions and returns null); a plugin dependency registrar overwrote IStoreContext with an unresolvable type; partial deployment.

Related errors

• Can't get implementation from the scope
• A theme descriptor ' ' has no system name
• A theme with ' ' system name is already defined
• No slides found with the specified picture id
• Payment method is not active

AI-assisted analysis of nopSolutions/nopCommerce@64bdf2ff08 (2026-08-13). Data as JSON: /api/errors/8caf9146533c7520. Report an issue: GitHub.

Appendix: source

Thrown at src/Libraries/Nop.Services/ScheduleTasks/TaskScheduler.cs:63

    /// </summary>
    /// <returns>A task that represents the asynchronous operation</returns>
    public virtual async Task InitializeAsync()
    {
        if (!DataSettingsManager.IsDatabaseInstalled())
            return;

        if (_taskThreads.Any())
            return;

        using var scope = _serviceScopeFactory.CreateScope();
        var scheduleTaskService = scope.ServiceProvider.GetService<IScheduleTaskService>() ?? throw new NullReferenceException($"Can't get {nameof(IScheduleTaskService)} implementation from the scope");

        //initialize and start schedule tasks
        var scheduleTasks = (await scheduleTaskService.GetAllTasksAsync())
            .OrderBy(x => x.Seconds)
            .ToList();

        var storeContext = scope.ServiceProvider.GetService<IStoreContext>() ?? throw new NullReferenceException($"Can't get {nameof(IStoreContext)} implementation from the scope");

        var store = await storeContext.GetCurrentStoreAsync();

        var scheduleTaskUrl = $"{store.Url.TrimEnd('/')}/{NopTaskDefaults.ScheduleTaskPath}";
        var timeout = _appSettings.Get<CommonConfig>().ScheduleTaskRunTimeout;

        foreach (var scheduleTask in scheduleTasks)
        {
            var taskThread = new TaskThread(scheduleTask, scheduleTaskUrl, timeout)
            {
                Seconds = scheduleTask.Seconds
            };

            //sometimes a task period could be set to several hours (or even days)
            //in this case a probability that it'll be run is quite small (an application could be restarted)
            //calculate time before start an interrupted task
            if (scheduleTask.LastStartUtc.HasValue)
            {

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