Please Help This Should Be Simple Trying To Use Variables With A Copy DB Control Flow, Ssis Reports Following Error:

Why isn't there some documentation on how to do this. This should be really simple and it has taken me 2 weeks and I still haven't gotten an answer. Please Help Does anyone know the answner or some place where there is some documentation!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I get the following error when I try to substitute the strings in the databasedetails collection with variables:
Error: Object reference not set to an instance of an object. StackTrace: at Microsoft.SqlServer.Dts.Tasks.TransferObjectsTask.TransferObjectsTask.CheckLocalandDestinationStatus(Database srcDatabase, DatabaseInfo dbDetail) at Microsoft.SqlServer.Dts.Tasks.TransferObjectsTask.TransferObjectsTask.TransferDatabasesUsingSpAttachDetach()

I created the following variables:
strDestinationDB = AirCL2Exp_new3
strDestinationDBPath = C:Program FilesMicrosoft SQL ServerMSSQL.2MSSQLDATAAirCL2Exp_new3_Data.mdf
strDestinationLGPath = C:Program FilesMicrosoft SQL ServerMSSQL.2MSSQLDATAAirCL2Exp_new3_Data.ldf
strSourceDB = AirCL2Exp
strSourceDBPath = C:Program FilesMicrosoft SQL ServerMSSQL.2MSSQLDataDataNewAirCL2Exp_Data.mdf
strSourceLGPath = C:Program FilesMicrosoft SQL ServerMSSQL.2MSSQLDataDataNewAirCL2Exp_Log.ldf

I then assigned those variable to DatabaseDetails Collection:

DatabaseName = @strSourceDB
DestinationDatabaseName = @strDestinationDB

Inaddtion I also assigned the following to the two DatabaseFiles Collection:
for 0:
DatabaseFileSize = 0
DestinationFilePath = @strDestinationDBPath
FileType = DatabaseFile
SourceFilePath = @strSourceDBPath
SourceSharePath = @strSourceDBPath

for 1:
DatabaseFileSize = 0
DestinationFilePath = @strDestinationLGPath
FileType = LogFile
SourceFilePath = @strSourceLGPath
SourceSharePath = @strSourceLGPath