<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">I just installed MacTex in my computer and surprisingly pstricks is not working. <DIV><BR class="khtml-block-placeholder"></DIV><DIV>When I process such a simple file like </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\documentclass{article}</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\usepackage[latin1]{inputenc}</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\usepackage{pst-all} </FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\begin{document}</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\begin{pspicture}(0,0)(2,2)</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF"> \psline[linewidth=1pt,linecolor=gray]{<->}(0.5,0)(0,1)(1,1.5)(1.5,1)(.5,.5)</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\end{pspicture}</FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#0000FF">\end{document}</FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" color="#000000">I get the error:</FONT><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" color="#FF0000">! Undefined control sequence.</FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000"><recently read> \c@lor@to@ps </FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000"> </FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000">l.15 \psline[linewidth=1pt,linecolor=gray]{<->}</FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000"> (0.5,0)(0,1)(1,1.5)(1.5,1)(...</FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000"><BR class="khtml-block-placeholder"></FONT></DIV><DIV><FONT class="Apple-style-span" color="#FF0000">? </FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Anything I did wrong? or anything I didn't? </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Thanks in advanced</DIV></DIV><BR><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BODY></HTML>