One possibility:<div><br></div><div><div><font face="courier new, monospace">(let ((cancelstring &quot;cancel&quot;))</font></div><div><font face="courier new, monospace">  (ps:ps* `(create</font></div><div><font face="courier new, monospace"><span class="Apple-tab-span" style="white-space:pre">	</span>    ,cancelstring &quot;val&quot;)))</font></div>
<br><div class="gmail_quote">On Tue, Aug 7, 2012 at 8:49 AM, F D <span dir="ltr">&lt;<a href="mailto:dubfa@hotmail.com" target="_blank">dubfa@hotmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



<div><div dir="ltr">
Hello,<br><br>How can I avoid to have an error in the following example:<br>(let ((cancelstring &quot;cancel&quot;))<br>             (ps::ps (ps:create<br>                          (ps::lisp cancelstring)  &quot;val&quot;)))<br>
<br>Error: Slot key (PARENSCRIPT:LISP CANCELSTRING) is not one of symbol, string or number.<br><br>Thank you<br> 		 	   		  </div></div>
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