You should
1. change getRealA(double f,double P) to getRealA([u][color=red]f,P[/color][/u]) in evolution tab under model page.
2. change "public void getRealA (double f ,double P) {" to "public [u][color=red]double[/color][/u] getRealA (double f ,double P) {"


And it will get rid of all the syntax error.