VB6 GroupProject – open form in another project

Hi,
Please help.
I am a newbie working on VB6 GroupProject which comprised of 2 projects which are (1) Sales (2) Marketing. Marketing Project is the startup project and on the menu screen the option to load DataEntry form from Sales Project is not working. I am getting this error message “Variable not Found”. On debug mode it highlighted FrmSalesEntry. How do I load the FrmSalesEntry ?

Thanks,
Have a good Day

Cheers,
Lennie