Elements.xml (renamed to ListManifest.xml):

<?xml version="1.0" encoding="utf-8" ?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <Receivers ListTemplateId="101">
        <Receiver>
            <Name>AddedEventHandler</Name>
            <Type>ItemAdded</Type>
            <SequenceNumber>10000</SequenceNumber>
            <Class>ChangeContentTypeEventHandler.ChangeContentTypeEventHandler</Class>
            <Data></Data>
            <Filter></Filter>
        </Receiver>
    </Receivers>
</Elements>

manifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<Solution xmlns="http://schemas.microsoft.com/sharepoint/"
  SolutionId="F9850E13-81B6-47E1-BBC6-42AC70A903C3" >
    <FeatureManifests>
        <FeatureManifest Location="List\Feature.xml"/>
    </FeatureManifests>
    <Assemblies>
       <Assembly DeploymentTarget="GlobalAssemblyCache"     Location="ChangeContentTypeEventHandler.dll"/>
    </Assemblies>
</Solution>

deploy.ddf:

.OPTION Explicit ; Generate errors
.Set DiskDirectory1="..\bin"
.Set CabinetNameTemplate="ChangeContentTypeEventHandler.wsp"

manifest.xml
.Set DestinationDir="List\ListTemplates"
List\ListTemplates\ListManifest.xml ; specify cab file name
.Set DestinationDir="List\Messages"
List\Messages\schema.xml
.Set DestinationDir="List"
List\Feature.xml
.Set DestinationDir=. 
..\bin\ChangeContentTypeEventHandler.dll ChangeContentTypeEventHandler.dll

Cannot insert the value NULL into column 'Assembly', table 'wss_content_rginfonet_bodsp2007app1.dbo.EventReceivers'; column does not allow nulls. INSERT fails. Cannot insert the value NULL into column 'Assembly', table 'wss_content_rginfonet_bodsp2007app1.dbo.EventReceivers'; column does not allow nulls. INSERT fails. The statement has been terminated. The statement has been terminated. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.SharePoint.Utilities.SqlSession.ExecuteNonQuery(SqlCommand command) at Microsoft.SharePoint.Administration.SPElementDefinitionCollection.ProvisionContentTypeAndEventReceiverBindings(SPFeaturePropertyCollection props, SPSite site, SPWeb web, Boolean fForce) at Microsoft.SharePoint.Administration.SPElementDefinitionCollection.ProvisionElements(SPFeaturePropertyCollection props, SPWebApplication webapp, SPSite site, SPWeb web, Boolean fForce) at Microsoft.SharePoint.SPFeature.ProvisionElements(SPFeaturePropertyCollection props, SPWebApplication webapp, SPSite site, SPWeb web, Boolean fForce) at Microsoft.SharePoint.SPFeature.Activate(SPSite siteParent, SPWeb webParent, SPFeaturePropertyCollection props, Boolean fForce) at Microsoft.SharePoint.SPFeatureCollection.AddInternal(Guid featureId, SPFeaturePropertyCollection properties, Boolean force, Boolean fMarkOnly) at Microsoft.SharePoint.SPFeatureCollection.Add(Guid featureId) at Microsoft.SharePoint.WebControls.FeatureActivator.BtnActivateFeature_Click(Object objSender, EventArgs evtargs) at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Cannot insert the value NULL into column 'Assembly', table 'wss_content_rginfonet_bodsp2007app1.dbo.EventReceivers'; column does not allow nulls. INSERT fails. 
Cannot insert the value NULL into column 'Assembly', table 'wss_content_rginfonet_bodsp2007app1.dbo.EventReceivers'; column does not allow nulls. INSERT fails. 
The statement has been terminated. 
The statement has been terminated.   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) 
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) 
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) 
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) 
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async) 
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) 
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() 
   at Microsoft.SharePoint.Utilities.SqlSession.ExecuteNonQuery(SqlCommand command) 
   at Microsoft.SharePoint.Administration.SPElementDefinitionCollection.ProvisionContentTypeAndEventReceiverBindings(SPFeaturePropertyCollection props, SPSite site, SPWeb web, Boolean fForce) 
   at Microsoft.SharePoint.Administration.SPElementDefinitionCollection.ProvisionElements(SPFeaturePropertyCollection props, SPWebApplication webapp, SPSite site, SPWeb web, Boolean fForce) 
   at Microsoft.SharePoint.SPFeature.ProvisionElements(SPFeaturePropertyCollection props, SPWebApplication webapp, SPSite site, SPWeb web, Boolean fForce) 
   at Microsoft.SharePoint.SPFeature.Activate(SPSite siteParent, SPWeb webParent, SPFeaturePropertyCollection props, Boolean fForce) 
   at Microsoft.SharePoint.SPFeatureCollection.AddInternal(Guid featureId, SPFeaturePropertyCollection properties, Boolean force, Boolean fMarkOnly) 
   at Microsoft.SharePoint.SPFeatureCollection.Add(Guid featureId) 
   at Microsoft.SharePoint.WebControls.FeatureActivator.BtnActivateFeature_Click(Object objSender, EventArgs evtargs) 
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e) 
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) 
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)