Export BLOB from SQLite database

Hi there I want to see whether I can use Pentaho for one of my applications! I use Spoon and I want to read a BLOB from an sqlite database file. I use the sqlite-jdbc-3.8.11.2 driver from Xerial. It works fine for other table fields, but not for a blob.
I receive the following error:

org.pentaho.di.trans.steps.scriptvalues_mod.ScriptValuesMetaMod@9cfee5 - ERROR (version 5.0.1-stable, build 1 from 2013-11-15_16-08-58 by buildguy) : Unable to get fields from previous steps because of an error

I use a table input to fetch the data
Any ideas are welcome :)

Thanks!