FPDF extension writetag.ext for Classic ASP - asp-classic

Question

I am trying to convert a FPDF extension to Classic Asp. I have installed FPDF for Classic Asp on our server (please no flame war regarding why we still use classic ASP). It works well for all that I have tried. Now I want to have the functionality of WriteTag.php as posted on GitHub under by CREACION DE HORARIOS.
In converting the php code I run into trouble with foreach(this.PileStyle as xval) in the function code below.
I have no idea where "this.PileStyle" comes from. It is this line that gives trouble, which at this time I can't describe, other than that the browser throws the "500 - Internal server error".
Note: there is more to this function, but the foreach shown in the code below is where the error first shows up. My testing so far involves adding small pieces of code to the "writetag.ext" file until an error shows up. I have worked on being able to get the extension loaded in when my "writetag.asp" file starts, until the error appeared. I have not been able to progress to and functional tests.
I have searched both, the PHP and the Classic ASP libraries for FPDF, and find no occurance of help for Classic ASP in this regard.
Any help, or instructions how to proceed, will be greatly appreciated.
this.FindStyle=function FindStyle(tag, ind) //Inheritance from parent elements
{
tag=trim(tag);
// Family
if(this.TagStyle[tag]["family"]!="")
family=this.TagStyle[tag]["family"];
else
{
foreach(this.PileStyle as val)
{
val=trim(val);
if(this.TagStyle[val]["family"]!="")
{
family=this.TagStyle[val]["family"];
break;
}
}
}