Error when using upgrade toolkit for 2013 R2

I hope someone could help me.

I’m trying to convert a database to 2013 R2 using the new version of the Upgrade Toolkit (

In my database I have 3 Companies. I have managed to perform step 11 (transfer data) for 2 Companies, but in Company 3 I got this error: “A call to System.Data.SqlClient.SqlCommand.ExecuteReader faile with this message: There is already an open DataReader associated with this Command wich must be closed first.”

I have tried to restart the Nav Service and have also tried to restart the server, but the same error shows up when I try to perform “Transfer Data”.