transaction not connected on oracle and PowerBuilder 9

sometime we got message when develop login form use Powerbuilder 9 and oracle11g database:
At this issue: the PC installed Oracle11g & PB9 both.
open lgin form from PB is ok , but when open application file (exe file). Got message:

"Transaction not connected"

no detail information about it;
please check below:
(1) make sure that PB...90.DLL not double in that PC.
(2) if have double PB...90.DLL please going to control panel - system - environment - path
(3) then check the path only pointed to ONE LOCATION of PB...90. DLL

hope this help you

he he he