Sub-reports using a button and pl/sql

[fish5871]

I am linking a main report anda sub report by using a button. The pl/sql code linking the two is:

srw.run_report('U:\is\lims\reports\oracle reports\lp2.rdf paramform=no destype=preview protocolno='||to_charprotocol_id))

Weh I run the form, I get an error message telling me to remove the userid/password from the code.
There is no userid/password code.