Please ensure that at least one printer is installed and retry

Dear all!

Last week I was able to print and print to PDF one workflow of mine. Yesterday and today this funktion does not work anymore. Does anybody have an idea on how to fix the problem?

Regards

We have installed on Mac OS X 10.7.5 the software Bonita BPM 7. There is a problem: when we send a print and select the print, the software have an alert with text "Please ensure that at least one printer is installed and retry"; How to solve the problem?
It is urgent, thank you.