An error occurred during local report processing. ->An error occurred during local report processing. ->ClassName

So I was Moving an RDLC Report from one applicaiton to another,

I was getting this excpetion..

(summary of the messages of the exception and it's inner exceptions:
An error occurred during local report processing. --->
 An error has occurred during report processing. --->
  StudTarReportCV

Where StudTarReportCV is the name of the class I'm passign in a list of with the reprot Data.

Not alot to go on, basically it says "Something Bad Happned with the CV class"

The Actual Problem was that the DataSet Name I was Passing it didnt' match the one defined in the RDLC.

RDLC-> StudTarReportCV
PassedToReportViewer->EFolderReportGenerator3G_CV_StudTarReportCV


So how I fixed it was to modify the XML in thie RDLC file so that the dataSet Definition matched the value i was passing in:

<DataSetName>EFolderReportGenerator3G_CV_StudTarReportCV</DataSetName>

and then modified the use of the data set in the Tablix to match there:

<DataSet Name="EFolderReportGenerator3G_CV_StudTarReportCV">
Voilia, it's all working now...Full Text of Exception, incase anyone else runs into it:

Exception in StudentTar Ex = Microsoft.Reporting.WinForms.LocalProcessingException: An error occurred during local report processing. ---> Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: An error has occurred during report processing. ---> Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: StudTarReportCV
   at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery()
   at Microsoft.ReportingServices.OnDemandProcessing.TablixProcessing.RuntimeOnDemandDataSet.Process()
   at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.ProcessConcurrent(Object threadSet)
   --- End of inner exception stack trace ---
   at Microsoft.ReportingServices.OnDemandProcessing.OnDemandProcessingContext.AbortHelper.ThrowAbortException(String reportUniqueName)
   at Microsoft.ReportingServices.OnDemandProcessing.OnDemandProcessingContext.CheckAndThrowIfAborted()
   at Microsoft.ReportingServices.OnDemandProcessing.RetrievalManager.FetchData(Boolean mergeTran)
   at Microsoft.ReportingServices.OnDemandProcessing.RetrievalManager.PrefetchData(ReportInstance reportInstance, ParameterInfoCollection parameters, Boolean mergeTran)
   at Microsoft.ReportingServices.OnDemandProcessing.Merge.FetchData(ReportInstance reportInstance, Boolean mergeTransaction)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessOdpReport(Report report, OnDemandMetadata odpMetadataFromSnapshot, ProcessingContext pc, Boolean snapshotProcessing, Boolean reprocessSnapshot, Boolean processUserSortFilterEvent, Boolean processWithCachedData, ErrorContext errorContext, DateTime executionTime, IChunkFactory cacheDataChunkFactory, StoreServerParameters storeServerParameters, GlobalIDOwnerCollection globalIDOwnerCollection, SortFilterEventInfoMap oldUserSortInformation, EventInformation newUserSortInformation, String oldUserSortEventSourceUniqueName, ExecutionLogContext executionLogContext, OnDemandProcessingContext& odpContext)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension newRenderer, DateTime executionTimeStamp, ProcessingContext pc, RenderingContext rc, IChunkFactory cacheDataChunkFactory, IChunkFactory yukonCompiledDefinition, Boolean& dataCached)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension newRenderer, DateTime executionTimeStamp, ProcessingContext pc, RenderingContext rc, IChunkFactory yukonCompiledDefinition)
   at Microsoft.Reporting.LocalService.CreateSnapshotAndRender(CatalogItemContextBase itemContext, ReportProcessing repProc, IRenderingExtension renderer, ProcessingContext pc, RenderingContext rc, SubreportCallbackHandler subreportHandler, ParameterInfoCollection parameters, DatasourceCredentialsCollection credentials)
   at Microsoft.Reporting.LocalService.Render(CatalogItemContextBase itemContext, Boolean allowInternalRenderers, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup)
   at Microsoft.Reporting.WinForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, CreateAndRegisterStream createStreamCallback, Warning[]& warnings)
   --- End of inner exception stack trace ---
   at Microsoft.Reporting.WinForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, CreateAndRegisterStream createStreamCallback, Warning[]& warnings)
   at Microsoft.Reporting.WinForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)
   at Microsoft.Reporting.WinForms.LocalReport.Render(String format, String deviceInfo, PageCountMode pageCountMode, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)
   at Microsoft.Reporting.WinForms.Report.Render(String format, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)
   at EFolderReportGenerator3G.Reporting.WinForms.ReportGenerator.GetReportResult(ReportRenderParameters reportRenderParameters) in D:\Project Files\EFolderReportGenerator3G\WinForm\EFolderReportGenerator3G.Reporting\Web\ReportGenerator.cs:line 206
   at EFolderReportGenerator3G.Reporting.WinForms.ReportGenerator.GetReportResult[T](String reportType, String dataSourceName, List`1 data, String reportFileName, List`1 reportParameters) in D:\Project Files\EFolderReportGenerator3G\WinForm\EFolderReportGenerator3G.Reporting\Web\ReportGenerator.cs:line 74
   at EFolderReportGenerator3G.BLL.BusinessObjects.ETarBLL.GetStudTarReportNew(StudTarReportArgumentCV criteria) in D:\Project Files\EFolderReportGenerator3G\WinForm\EFolderReportGenerator3G.BLL\BusinessObjects\ETarBLL.cs:line 1398
   at EFolderReportGenerator3G.BLL.BusinessObjects.ETarBLL.SaveStudTarReportNew(String& fnameExt, String& mineType, String rollingOrPy, EFolderReportArgCV args, StudentCV studentCv) in D:\Project Files\EFolderReportGenerator3G\WinForm\EFolderReportGenerator3G.BLL\BusinessObjects\ETarBLL.cs:line 1460