I was trying to create a master Math programm including Algebra, Analysis and Stochastics programs, but no matter what i did i got ERR:LABEL when i tested it. So i tried just to write the Analysis part first using cemetech.net but that would't work either even though i did not use any Goto's. Here's the Code :

:Menu("Analysis","Bogenlaenge",1,"Quadfkt",2,"Rotation",3,"Quit",7

:lbl 7

:Return

:lbl 1

:ClrHome

:Input "f(x:",Str1

:String►Equ(Str1,{Y0}

:Input "a:",A

:Input "b:",B

:FnInt(sqrt(1+(nDeriv({Y0},X,X)){^2}),X,A,B→S

:Disp S

:Output(4,1,"S=

:"→{Y0}

:Return

:lbl 2

:Disp "AX{^2}+BX+C=0

:Prompt A,B,C

:If A=0:Then:Disp "KEINE QUADR.GL.":Return:End

:B/A→P

:C/A→Q

:P{^2}/4-Q→D

:Disp "DISKR.=",D

:If D<0:Disp "KEINE LOESUNG

:If D=0:Disp "EINE LOESUNG",{-}P/2

:If D>0:Disp "X1=",{-}P/2+sqrt(D)►Frac,"X2=",{-}P/2-sqrt(D)►Frac

:Return

:lbl 3

:Menu("ROTATE","EINE FKT",5,"ZWEI FKT",6,"END",4

:Lbl 5

:ClrHome

:Input "f(x:",Str1

:String►Equ(Str1,{Y0}

:Input "a:",A

:Input "b:",B

:π*FnInt(abs({Y0}{^2}),X,A,B→V

:Disp "VE= ",V

:Disp "VEπ= ",(V/π)►Frac

:"→{Y0}

:lbl 4

:Return

:Lbl 6

:ClrHome

:Input "F(X:",Str1

:Input "G(X:",Str2

:String►Equ(Str1,{Y0}

:String►Equ(Str2,{Y9}

:Input "A: ",C

:Input "B: ",D

:π*FnInt(abs(({Y0}){^2}-({Y9}){^2}),X,C,D→V

:Disp "VE=",V

:Disp "VEπ=",(V/π)►Frac

:"→{Y0}

:"→{Y9}

:Return

Can anyone help me finding the mistake xD ?