Article ID: 958287 - Last Review: January 20, 2012 - Revision: 2.2

Error message when you view an activity form in Microsoft Dynamics CRM 4.0: "Exception of type 'System.Web.HttpUnhandledException' was thrown"

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SYMPTOMS

When you view an activity form in Microsoft Dynamics CRM 4.0, you receive the following error message:

Error: Exception of type 'System.Web.HttpUnhandledException' was thrown. Error Message: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Error Details: Exception of type 'System.Web.HttpUnhandledException' was thrown. Source File: Not available Line Number: Not available Request URL: http://URL
Stack Trace Info: [ArgumentNullException: Key cannot be null. Parameter name: key] at System.Collections.Hashtable.ContainsKey(Object key) at System.Collections.Hashtable.Contains(Object key) at Microsoft.Crm.Metadata.PreloadedMetadataCacheDataProvider.TryGetEntity(String entityName, NameMappingType mapping) at Microsoft.Crm.Metadata.DynamicMetadataCache.GetEntity(String entityName, NameMappingType mapping) at Microsoft.Crm.Security.User.HasPrivilege(IUser user, String entityName, PrivilegeType privilegeType, PrivilegeDepth privilegeDepth) at Microsoft.Crm.Security.User.HasPrivilege(IUser user, String entityName, AccessRights accessRights, PrivilegeDepth privilegeDepth) at Microsoft.Crm.Security.User.HasPrivilege(IUser user, String entityName, AccessRights accessRights) at Microsoft.Crm.Application.Components.Sdk.FormControls.Web.LookupControl.set_LookupTypes(Int32[] value) at Microsoft.Crm.Application.Components.Sdk.FormControls.Web.LookupControl.set_Metadata(AttributeMetadata value) at Microsoft.Crm.Application.ControlActivator.CreateControl(ControlDescriptor controlDescriptor, String clientId) at Microsoft.Crm.Application.Forms.CrudForm.BuildFormModel(FormDescriptor formDescriptor) at Microsoft.Crm.Application.Forms.CustomizableForm.Execute(Entity entity, String formType) at Microsoft.Crm.Application.Forms.CustomizableForm.Execute(Entity entity) at Microsoft.Crm.Web.Activities.BasicActivityPage.ConfigureForm() at Microsoft.Crm.Web.Activities.PhoneCallDetailPage.ConfigureForm() at Microsoft.Crm.Application.Controls.AppUIPage.OnPreRender(EventArgs e) at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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CAUSE

This problem occurs because the FormDescriptor object caches some entity metadata. Therefore, an ArgumentNullException exception occurs.

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RESOLUTION

This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

949256 (http://support.microsoft.com/kb/949256/ ) Microsoft Dynamics CRM 4.0 updates and hotfixes

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

For more information about Microsoft Dynamics CRM software hotfix and update package terminology, click the following article number to view the article in the Microsoft Knowledge Base:

887283 (http://support.microsoft.com/kb/887283/ ) Microsoft Business Solutions CRM software hotfix and update package naming standards

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