null reference exception in cmd.new1

i have a program that uses SQL

I have added the necessary components and objects

con.New1
cmd.New1("", con.Value)

at the cmd.New1 my PPC returns error
"NullReferenceException"

desktop returns error
Object reference not set to an instance of an object

and the program terminates there. I cannot figure out what is the problem.

after i added a form it was fine. i tried to run it without any forms