Error “expected double”

Hello,

I am trying to add a custom column on a watchlist but I am getting error “expected double”. I am not able to figure out what I am doing wrong. Here’s the code below..

input vpriceType = PriceType.MARK;

plot plot_name;

if (GetSymbol() == “EDIT”) then {

if ((((21.32 – 20.13 ) * 1.0 ) + 21.32) <= vpricetype)

then { plot_name = 1.1; }

else if ((((21.32 – 20.13 ) * 2.0 ) + 21.32) <= vpricetype) then { plot_name = 2.1; }

else if ((((21.32 – 20.13 ) * 3.0 ) + 21.32) <= vpricetype) then { plot_name = 3.1; }

else if ((((21.32 – 20.13 ) * 4.0 ) + 21.32) <= vpricetype) then { plot_name = 4.1; }

else if ((((21.32 – 20.13 ) * 5.0 ) + 21.32) <= vpricetype) then { plot_name = 5.1; }

else { plot_name = 0.0; }}

else if (GetSymbol() == “AMD”)

then { plot_name = 2.1; }

else { plot_name = 0.0; };