Allocate a storage location for all the output files, and set the graphics environment. The HTML device driver generates output that includes both HTML and GIF files, so the libref must point to an aggregate storage location. It cannot point to a file. 
/* define the output location */
filename webout 'path-to-Web-server';
   /* set the graphics environment */
goptions reset=global gunit=pct
         colors=(black blue green red);