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I get a syntax error on the second signal equation. Is it possible to have two signal equations?

smpl 1960 2015q2
sspace Kozicki

Kozicki.append @signal gap=sv2+(c(4)/2)*(sv5+sv6)
Kozicki.append @signal r=sv1
Kozicki.append @state sv2=c(1)*sv2(-1)+c(2)*sv3(-1)+[ename=e1,var=@exp(c(3))]
Kozicki.append @state sv3=sv2(-1)
Kozicki.append @state sv4=sv4(-1)+[ename=e2,@exp(c(5))]
Kozicki.append @state sv5=sv1(-1)-sv4(-1)
Kozicki.append @state sv6=sv5(-1)

This may or may not be the problem, but where is sv1 defined?

sv1 is a second signal variable. It is equal to r which is observed but I do not have a separate equation for it.

Ah, that's it. As it says in the Help system
"Signal equations may not contain current values or leads of signal variables."