In your log file is the following:
BETWEEN 20160701 and 20160731 and d.ob_datee BETWEEN 20160701 and 20160731 and ob_hour between 0 and 23 ORDER BY stat_id,ob_dates,ob_hour"
Error in .local(conn, statement, …) :
could not run statement: Unknown column ‘d.SO4_ob’ in ‘field list’
Calls: query_dbase … db_Query -> dbSendQuery -> dbSendQuery -> .local -> .Call
Execution halted
This may indicate that the observation data that you are trying to use to create the plot for doesn’t contain the SO4_ob values.
Can you share the name of the script that you ran when you obtained this error?
Have you downloaded the AMET-AQ Observation Data available from this link? https://drive.google.com/drive/folders/1k37U9USjp6_vpr77BCyZ_JrxGtLudRWG