Lightspeed throws null reference exeption

uow.Add(simpleEntity)

throws a null reference exception from:

Mindscape.LightSpeed.Entity.GeneratedId()

working against sql server, KeyTable Id.

Exception dump is:

{"Object reference not set to an instance of an object."}
    [System.NullReferenceException]: {"Object reference not set to an instance of an object."}
    Data: {System.Collections.ListDictionaryInternal}
    HelpLink: null
    InnerException: null
    Message: "Object reference not set to an instance of an object."
    Source: "Mindscape.LightSpeed"
    StackTrace: "   at Mindscape.LightSpeed.Entity.GeneratedId()\r\n   at Mindscape.LightSpeed.Entity`1.get_Id()\r\n   at Mindscape.LightSpeed.Entity`1.get_IdInternal()\r\n   at Mindscape.LightSpeed.Model.TypeModel.(Entity )\r\n   at Mindscape.LightSpeed.Entity.get_UniqueId()\r\n   at Mindscape.LightSpeed.UnitOfWork.(Entity )\r\n   at Mindscape.LightSpeed.UnitOfWork.Add(Entity entity)\r\n   at Eshkol.Domain.Repositories.ExerciseRepository.Add(Exercise exercise) in C:\\Users\\neta\\Documents\\Visual Studio 2008\\Projects\\Eshkol\\Src\\Eshkol.Domain\\Repositories\\ExerciseRepository.cs:line 18"
    TargetSite: {System.Object GeneratedId()}

LS model is:

<?xml version="1.0" encoding="utf-8"?>
<model dslVersion="1.1.0.0" name="Eshkol" targetNamespace="Eshkol.Domain.Entities" databaseProvider="SqlServer2005" connectionString="Data Source=GUY-LAPTOP\SQLEXPRESS;Initial Catalog=EshkolDev;Integrated Security=True;Pooling=False" pluralizedInDatabase="false" mediumTrustCompatibility="false" xmlns="http://namespaces.mindscape.co.nz/lightspeed">
  <entities>
    <entity name="Exercise" identityType="Int32" cacheExpiry="0" identityMethod="KeyTable">
      <entityProperties>
        <entityProperty name="Body" columnName="Body">
          <validations>
            <presenceValidation />
          </validations>
        </entityProperty>
      </entityProperties>
      <throughAssociationTargets>
        <throughAssociation Id="3a7b279f-3fbd-40cc-af71-accafa40091c" sourceCollectionName="Exercises" targetCollectionName="Subjects" autoThroughEntity="ExerciseSubjectRelation">
          <entityMoniker name="/Eshkol/Subject" />
        </throughAssociation>
      </throughAssociationTargets>
    </entity>
    <entity name="Subject" identityType="Int32" cacheExpiry="0" identityMethod="KeyTable">
      <entityProperties>
        <entityProperty name="Name">
          <validations>
            <presenceValidation />
            <formatValidation pattern=".+" />
          </validations>
        </entityProperty>
      </entityProperties>
      <oneToManyAssociations>
        <oneToManyAssociation Id="c6faa82a-042a-4394-a5fb-a6b725e1ce2e" collectionName="ChildSubjects" backreferenceName="FatherSubject" isNullable="true" inheritance="Virtual">
          <entityMoniker name="/Eshkol/Subject" />
        </oneToManyAssociation>
      </oneToManyAssociations>
    </entity>
  </entities>
</model>

Exception dump is:

{"Object reference not set to an instance of an object."}
    [System.NullReferenceException]: {"Object reference not set to an instance of an object."}
    Data: {System.Collections.ListDictionaryInternal}
    HelpLink: null
    InnerException: null
    Message: "Object reference not set to an instance of an object."
    Source: "Mindscape.LightSpeed"
    StackTrace: "   at Mindscape.LightSpeed.Entity.GeneratedId()\r\n   at Mindscape.LightSpeed.Entity`1.get_Id()\r\n   at Mindscape.LightSpeed.Entity`1.get_IdInternal()\r\n   at Mindscape.LightSpeed.Model.TypeModel.(Entity )\r\n   at Mindscape.LightSpeed.Entity.get_UniqueId()\r\n   at Mindscape.LightSpeed.UnitOfWork.(Entity )\r\n   at Mindscape.LightSpeed.UnitOfWork.Add(Entity entity)\r\n   at Eshkol.Domain.Repositories.ExerciseRepository.Add(Exercise exercise) in C:\\Users\\neta\\Documents\\Visual Studio 2008\\Projects\\Eshkol\\Src\\Eshkol.Domain\\Repositories\\ExerciseRepository.cs:line 18"
    TargetSite: {System.Object GeneratedId()}

LS model is:

<?xml version="1.0" encoding="utf-8"?>
<model dslVersion="1.1.0.0" name="Eshkol" targetNamespace="Eshkol.Domain.Entities" databaseProvider="SqlServer2005" connectionString="Data Source=GUY-LAPTOP\SQLEXPRESS;Initial Catalog=EshkolDev;Integrated Security=True;Pooling=False" pluralizedInDatabase="false" mediumTrustCompatibility="false" xmlns="http://namespaces.mindscape.co.nz/lightspeed">
  <entities>
    <entity name="Exercise" identityType="Int32" cacheExpiry="0" identityMethod="KeyTable">
      <entityProperties>
        <entityProperty name="Body" columnName="Body">
          <validations>
            <presenceValidation />
          </validations>
        </entityProperty>
      </entityProperties>
      <throughAssociationTargets>
        <throughAssociation Id="3a7b279f-3fbd-40cc-af71-accafa40091c" sourceCollectionName="Exercises" targetCollectionName="Subjects" autoThroughEntity="ExerciseSubjectRelation">
          <entityMoniker name="/Eshkol/Subject" />
        </throughAssociation>
      </throughAssociationTargets>
    </entity>
    <entity name="Subject" identityType="Int32" cacheExpiry="0" identityMethod="KeyTable">
      <entityProperties>
        <entityProperty name="Name">
          <validations>
            <presenceValidation />
            <formatValidation pattern=".+" />
          </validations>
        </entityProperty>
      </entityProperties>
      <oneToManyAssociations>
        <oneToManyAssociation Id="c6faa82a-042a-4394-a5fb-a6b725e1ce2e" collectionName="ChildSubjects" backreferenceName="FatherSubject" isNullable="true" inheritance="Virtual">
          <entityMoniker name="/Eshkol/Subject" />
        </oneToManyAssociation>
      </oneToManyAssociations>
    </entity>
  </entities>
</model>

Could you post a stack trace and a repro please?  Thanks!

There is a stack trace (obfuscated) in the exception dump.

The repro on my machine (Vista, VS 2008, SQL Express .dbo, ls 2 or3 doesn't matter) is a trivial entity creation.

Oops, sorry, missed that (we seem to be having some issues with the forums software).

It looks from the stack trace like UnitOfWork.Context isn't set.  Make sure to create your unit of work using LightSpeedContext.CreateUnitOfWork, rather than new-ing it up directly; or if you do need to new it up directly, make sure to set the Context property before using it.