easylanguage syntax error

hi,
i got this easylenguage code:


[LegacyColorValue = TRUE];

{ ======================================= HEADER ====================================
Poly Inner Channel.
This indicator plots a regression line and two standard deviation bands around it.



====================================== DECLARATIONS ==================================}

inputs:
Len (150),
RedLineLen(150),
Order (3),
SDev(.5),{why not make these inputs}
Price (c); {this cannot be a var, for some reason}


vars:
CURSOR (FALSE),
LASTBAR (TRUE),
sigma (0),
f (0),
Y(0),
b0 (0),
b1 (0),
b2 (0),
b3 (0),
b4 (0);


VARS:
JLAOK(TRUE),
JLAPASS1(0),
JLAPASS2(0),
JLAPASS3(0),
JLAPASS4(0),
JLAPASS5(0),
JLAPASS6(0);


{=========================================MAIN PROGRAM ===================================}

VALUE98=POLY_COEFFS(price,len,order,CURSOR,LASTBAR,b0,b1,b2,b3,b4);
value97=LinearRegValue( Price, RedLineLen, 0 );

if (lastbaronchart and lastbar) or (atcommentarybar and cursor) then
begin

sigma= stddev(price,len);

y=(len-1);
f=0;
while y>(-2)
begin

value5=( b0
+(b1 *f )
+(b2*(power(f, 2)))
+(b3*(power(f, 3)))
+(b4*(power(f, 4)))
);

plot1[y] (value5,"regression");
plot2[y] (value5 + (sdev * sigma ),"Channel+1");
plot3[y] (value5 - (sdev * sigma ),"LChannel -1");
plot4[y] (value97[y], "LR Momentum" );
y=y-1;
f=f+1;
end;
end;


{
commentarycl("b0 = ", b0);
commentarycl("b1 = ", b1);
commentarycl("b2 = ", b2);
commentarycl("b3 = ", b3);
commentarycl("b4 = ", b4);
}


plotting it in Multicharts 10.0 i recive this Message: Error in study....
... trying to acces future data.Bar reference value: -1.

Can anybody tell me where is the problem in this code and give me a solution?
i use it on metastock historical data

thank you very much