[From string (line 31) ]                           
                                                   
@startgantt                                        
!$STL = {                                          
                                                   
!function $Scal($val)                              
  !return (%intval($val) / 500)                    
!endfunction                                       
                                                   
                                                   
!$t=$STL.log2[1].Dvalue                            
[$STL.log2[0].str - $t] as [0] lasts $Scal($t) days
  !return (%intval($val) / 500)                    
                                                   
!$size=%size($STL.log2)                            
!$c=1                                              
!while $c <= $size-2                               
^^^^^                                              
 Parsing syntax error about $size-2