When browsing to the Snow License Manager Web Portal it is throwing one of the below error message(s).

Runtime Error

Description: An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated.

Alternatively on later versions of Snow License Manager you may see the error below displayed:

Object reference not set to an instance of an object.

From examining the C:\Program Files\Snow Software\Snow License Manager\Web\Logs\Error\*.log you may see an error similar to below:

___________________________________________________________________________

Date:    2022-06-29

Application: 

Version:   0.0  Revision  Build 0

Log level:  ERROR

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TIME     TYPE    CATEGORY      TEXT

16:42:26,995 ERROR   APPLICATION     Application error. [PAGE: (unknown) | EXCEPTION: An error occurred while attempting to automatically activate registration 'Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope'. See the inner exception for information on the source of the failure. ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = IBus (DelegateActivator), Services = [Rebus.Bus.IBus], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> Could not resolve Rebus.Transport.ITransport with decorator depth 0 - registrations: Rebus.Injection.Injectionist+Handler (See inner exception for details.) (See inner exception for details.) (See inner exception for details.) (Void StartStartableComponents(Autofac.IComponentContext), Autofac) | INNER EXCEPTION: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = RebusMessageBus (ReflectionActivator), Services = [SnowSoftware.LicenseManager.MessageBus.IMessageBus, AutoActivate], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = IBus (DelegateActivator), Services = [Rebus.Bus.IBus], Lifetime = Autofac.Core.Lifetime.RootScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> Could not resolve Rebus.Transport.ITransport with decorator depth 0 - registrations: Rebus.Injection.Injectionist+Handler (See inner exception for details.) (See inner exception for details.) (System.Object Activate(System.Collections.Generic.IEnumerable`1[Autofac.Core.Parameter]), Autofac)]

16:42:40,647 ERROR   APPLICATION     Application error. [PAGE: (unknown) | EXCEPTION: Object reference not set to an instance of an object. (Void Application_End(System.Object, System.EventArgs), SnowLicenseManagerWeb)]

Snow License Manager 9.x.x

Snow Product license information is not entered correctly or haven't entered yet.
Alternatively the connection string from the web.config file is incorrect.

Another cause of this issue is corruption in the DLL in the Global Assembly Cache (GAC)

1.Ensure that the Web Configurator Database tab is correctly setup and does not show any issue when you run a Test Connection:

2.Next check the details on the License tab from the Web Configurator and the web.config from C:\Program Files\Snow Software\Snow License Manager\Web

3.Once those are correctly configured, restart the Snow License Manager pool from within IIS:

4.Close any open web browser sessions.

5.Wait for couple of minutes then open a new web browser to try accessing the Snow License Manager Web portal.

Additional Notes: 
If the issue is not related to the Web configurator, the next step would be to recycle the Application Pool or run an IISRESET command on the Snow web server in order to clear the cache in the Global Assembly Cache (GAC).

Recycling the application pool will allow any current transactions to complete. When the pool is recycled, IIS creates a new process to serve new requests and then will try to move all requests to the new process.

To recycle the application pool, launch IIS Manager, click on Application Pools, select SnowLicenseManager.  Then choose Recycle from the Action menu.


When an IISRESET command is run, it stops and starts the whole web server. This means that any active connections are lost.  You can first try to recycle the Application Pool and if that does not work, then run the IISRESET command.


Relaunch the Snow website.  If you are still getting the error, contact Snow Support.

Web.config connectionstring and or details on the web configurator are not filled in correctly.

Or

The DLL may be corrupt in the GAC