Granger Causality with panel data, using gcause

Hey,

I am traying to test Granger causality with panel, I installed gcause in order to do so but if using normal:

gcause var1 var2, lag (2) regress

I keep getting error "option / required"

The only way it works is when using gcause2, which allows only estimation for a panel unit at a time...

Any thoughts ?

Thx,
Kristina