global variable

Hi

please please please help me.

I'm looking for this question for a week. none of the answers in websites isn't true.

I can't define a global variable from two ways that solid works adjusted:

1) tool>equation & 2) graphical area.(please find the picture in attachment)

when i define global variable in tool -> equation it says "syntax error..." and nothing happen.

It should be noted that, I have not any KB3072630 update file and this answer made me crazy.

I think global variable has been not define in my solid work 2018 sp1.

SolidworksGeneral