You did some mistakes
-You entered 2 limits that contradict each other in "Goal" blocks. While you're defining a limit less than <> dB in 25-32, you also defined another limit Greater Than <> in the same frequency band. They were in a contradiction.
-You entered "freq" variable without units. You should enter them as 25e9 and 32e9.
Because ADS Optimization Engine does not know which unit you're working on.
I have corrected and re-named the project.You can continue to work but there are some other design problems because dB(S(2,1)) is negative, you have to correct this.