i Access Client Solutions Error

This is the "i Access on a stick" (java) product. I'm trying to run a file transfer via QSH with the product installed on the i.

I've gotten past some of the initial hurdles but keep getting the following MSGNL001 error (command invocation shown too):

java -jar /home/rharman/iac/acsbundle.jar -Dos400.class.path.security.check=0 /PLUGIN=download

/file=/home/rharman/yscust.dtfx /userid=RHARMAN
MSGNL001 - An error occurred during character conversion. (null)
$

The source table was created via SQL as "create table blahblah as..... select......"
The destination is a tab-delimited file in the IFS.

I can run the DTFX file from my Windows workstation (with the IAC product) and it runs fine.

I used iNav to look at the SQL create statement and it shows CCSID 37, all columns not null.

Anyone using this product? Anyone seen that MSGNL001 error? Where can I look for the offending record/column/whatever?

Thanks.