changing replicate do table on master - error on restart (no replies)

Master was running with the following:

server-id=1
log-bin = /opt/bitnami/mysql/data/mysql_bin.log
replicate-wild-do-table=my_database

I thought I could just simply change to:

log-bin = /opt/bitnami/mysql/data/mysql_bin2.log
replicate-wild-do-table=my_database2
And just restart mysql, but instead got an error:

[ERROR] Could not add do table rule 'my_database2'

I tried changing back to the old settings, but that failed to start as well. What did I do wrong and what should I have done? How do I fix this now?

Thanks for any help.