I am attempting this query in a postgresql snap:

"SELECT cm.id, cm.created_at, cm.context_id, cm.context_type, cm.conversation_id, 
cm.author_id, cm.generated,c.udpated_at FROM canvas_le.conversation_messages cm 
JOIN canvas_le.conversations c 
ON cm.conversation_id = c.id
WHERE CAST('"+$max_dttm+"' AS TIMESTAMP) < 
CAST(c.updated_at AS TIMESTAMP) AT TIME ZONE 'UTC';"  

Where $max_dttm contains a mapped value incoming from a mapper snap. I am getting the following error:
“reason”:
“org.postgresql.util.PSQLException: ERROR: current transaction is aborted, commands
ignored until end of transaction block”

What does this error mean?