Has anyone seen this error before?

2009-11-24 10:20:43,220 ERROR NHibernate.ByteCode.Castle.ProxyFactory - Creating a proxy instance failed
System.Runtime.InteropServices.COMException (0x800703FA): Illegal operation attempted on a registry key that has been marked for deletion. (Exception from HRESULT: 0x800703FA)
at System.Reflection.Assembly._nDefineDynamicModule(Assembly containingAssembly, Boolean emitSymbolInfo, String filename, StackCrawlMark& stackMark)
at System.Reflection.Emit.AssemblyBuilder.DefineDynamicModuleInternalNoLock(String name, Boolean emitSymbolInfo, StackCrawlMark& stackMark)
at System.Reflection.Emit.AssemblyBuilder.DefineDynamicModuleInternal(String name, Boolean emitSymbolInfo, StackCrawlMark& stackMark)
at System.Reflection.Emit.AssemblyBuilder.DefineDynamicModule(String name, Boolean emitSymbolInfo)
at Castle.DynamicProxy.ModuleScope.CreateModule(Boolean signStrongName)
at Castle.DynamicProxy.ModuleScope.ObtainDynamicModuleWithWeakName()
at Castle.DynamicProxy.Generators.Emitters.ClassEmitter.CreateTypeBuilder(ModuleScope modulescope, String name, Type baseType, Type[] interfaces, TypeAttributes flags, Boolean forceUnsigned)
at Castle.DynamicProxy.Generators.Emitters.ClassEmitter..ctor(ModuleScope modulescope, String name, Type baseType, Type[] interfaces, TypeAttributes flags, Boolean forceUnsigned)
at Castle.DynamicProxy.Generators.Emitters.ClassEmitter..ctor(ModuleScope modulescope, String name, Type baseType, Type[] interfaces)
at Castle.DynamicProxy.Generators.BaseProxyGenerator.BuildClassEmitter(String typeName, Type parentType, Type[] interfaces)
at Castle.DynamicProxy.Generators.ClassProxyGenerator.GenerateCode(Type[] interfaces, ProxyGenerationOptions options)
at Castle.DynamicProxy.ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, Object[] constructorArguments, IInterceptor[] interceptors)
at Castle.DynamicProxy.ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, IInterceptor[] interceptors)
at NHibernate.ByteCode.Castle.ProxyFactory.GetProxy(Object id, ISessionImplementor session)


I am using NHibernate 2.1, FluentNHibernate with an asp.net mvc application. I only see this error after an appsetting in the web.config has been changed. Before the config is changed I can execute the criteria fine. below is my entity structure and fluentNHibernate map


public class ProjectTotal : EntityBase
{
#region Properties

public virtual decimal Amount { get; set; }
public virtual int MonthNumber { get; set; }
public virtual Project Project { get; set; }
public virtual int ProjectTotalId { get; set; }
public virtual Scenario Scenario { get; set; }

#endregion
}


public class ProjectTotalMap : ClassMap<ProjectTotal>
{
#region Constructors

public ProjectTotalMap()
{
Schema("CapEx");

Id(x => x.ProjectTotalId).GeneratedBy.Identity();
References(x => x.Project).Column("ProjectId").Not.Nullable();
References(x => x.Scenario).Column("ScenarioId").Not.Nullable();
Map(x => x.MonthNumber).Not.Nullable();
Map(x => x.Amount).Not.Nullable();
}

#endregion
}

public class BaseProject : EntityBase, IAuditEntity
{
#region Properties

public virtual string Name { get; set; }
public virtual int? ProjectId { get; set; }

public virtual int GLAccountId { get; set; }
public virtual int GLSubAccountId { get; set; }
public virtual string PropId { get; set; }
public virtual int FiscalYear { get; set; }
public virtual DateTime? StartDate { get; set; }
public virtual string AppliesToUnits { get; set; }
public virtual int TotalMonths { get; set; }
public virtual decimal EstimatedAmount { get; set; }
public virtual string Location { get; set; }
public virtual string Description { get; set; }
public virtual string WorkReason { get; set; }
public virtual string Notes { get; set; }
public virtual string AssignedTo { get; set; }
public virtual bool IsBudgeted { get; set; }
#endregion

#region IAuditEntity Members

public virtual string CreatedBy { get; set; }

public virtual DateTime CreationDate { get; set; }

public virtual string ModifiedBy { get; set; }

public virtual DateTime ModifiedDate { get; set; }

#endregion
}

public class Project : BaseProject
{
}

public class ProjectMap : BaseProjectMap<Project>
{

}

public class BaseProjectMap<T> : ClassMap<T>
where T:BaseProject
{
#region Constructors

public BaseProjectMap()
{
Schema("CapEx");
Table("Project");
Id(x => x.ProjectId).GeneratedBy.Identity();
Map(x => x.Name).Not.Nullable().Length(200);

Map(x => x.IsBudgeted);

Map(x => x.AppliesToUnits).Length(200);
Map(x => x.AssignedTo).Length(50);
Map(x => x.Description).Length(8000);
Map(x => x.EstimatedAmount);
Map(x => x.FiscalYear);
Map(x => x.GLAccountId).Not.Nullable();
Map(x => x.GLSubAccountId).Not.Nullable();
Map(x => x.Location).Length(200);
Map(x => x.Notes).Length(8000);
Map(x => x.PropId).Length(3);
Map(x => x.StartDate);
Map(x => x.TotalMonths);
Map(x => x.WorkReason);

Map(x => x.CreatedBy).Not.Nullable();
Map(x => x.CreationDate).Not.Nullable();
Map(x => x.ModifiedBy).Not.Nullable();
Map(x => x.ModifiedDate).Not.Nullable();
}

#endregion
}

Here is the criteria I am trying to execute
ICriteria projectTotalCriteria = session.CreateCriteria(typeof(ProjectTotal));
projectTotalCriteria.CreateCriteria("Project")
.Add(Restrictions.And(Restrictions.Eq("FiscalYear", year), Restrictions.Eq("PropId", propId)));