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Hi, This code generates an error while it was working fine a month ago. Best regards, Fabrice \definecolor[mycolor][c=.4,m=0,y=0,k=0] \starttext \start \switchtobodyfont[small] \startMPcode input hvdm; input tex; l:=3mm; r:=0.6; alfa:=45; beta:=0; gamma:=0; defineDefaultArrow (l, r, alfa, beta, gamma); numeric xmin, xmax, ymin, ymax; xmin := 0; xmax := 110; ymax :=8000 ;ymin:=0; u := 0.1cm; v:= 0.002cm; color mycolor; mycolor:=(0.4,0,0); drawoptions(withpen pencircle scaled 0.3pt withcolor \MPcolor{mycolor}); draw hlingrid(ymin,ymax,1000,16cm,11cm); draw vlingrid(xmin,xmax,10,11cm,16cm); pickup pencircle scaled 1pt ; arrowline ((xmin,0) -- (xmax,0)) scaled u; arrowline ((0,ymin) -- (0,ymax)) scaled v; drawoptions(withpen pencircle scaled 1pt); draw tightfunction ("x", "x*x-84*x+5000", 0, 100, 0.01) xyscaled (u,v); for i=0 step 10 until 100: label.bot(TEX("$"&decimal(i)&"$"),(i*u,0)); endfor; for i=0 step 1000 until 7000: label.lft(TEX("$"&decimal(i)&"$"),(0,i*v)); endfor; label.top("Nombre de lots",(90u,50v)); label.lrt(btex $f(x)$ (en euros) etex,(0,7800v)); \stopMPcode \stop \stoptext