Getting "PubSub Error Cannot read property 'widths' of undefined TypeError: Cannot read property 'widths' of undefined" - jspdf

Question

I want to add custom font to jspdf document.
I am loading the file , converting it into base64 and then adding the font toVFS.
But I face the following error when I try to add the font and eventually the text to the pdf document.
PubSub Error No unicode cmap for font Error: No unicode cmap for font
Here is code:
getBase64 = (file)=>{
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => {
resolve(reader.result);
};
reader.onerror = error => reject(error);
});
};
downLoadPDF(){
console.log("download pdf");
let x= 10,y=40, page = 1;
var doc = new jsPDF("p", "mm", "a4");
doc.setFontSize(10);
doc.text("Page "+page++ , 185, 6);
var client = new XMLHttpRequest();
let inst = this;
client.open('GET', 'assets/fonts/Roboto-Bold.ttf');
client.onloadend = function() {
var fileData:any = client.responseText;
inst.getBase64(new Blob([fileData])).then((data:string)=>{
//Was getting "jsPDF PubSub Error Invalid string. Length must be a multiple of 4 Error: Invalid //string. Length must be a multiple of 4" error. So added the below line.
data = data + '='.repeat(4 - data.length % 4);
doc.addFileToVFS("Roboto-Bold.ttf",data);
doc.addFont("Roboto-Bold.ttf","Roboto-Bold","normal");
doc.setFont("Roboto-Bold","normal");
//Here, I get the following error:
//jsPDF PubSub Error No unicode cmap for font Error: No unicode cmap for font
//at i.registerTTF (jspdf.min.js:262)
//at new i (jspdf.min.js:262)
//at Function.i.open (jspdf.min.js:262)
//at Object.<anonymous> (jspdf.min.js:173)
//at oe.publish (jspdf.min.js:29)
//at Object.yt (jspdf.min.js:29)
//at Object.l.addFont (jspdf.min.js:29)
doc.text("Company Name: Avaya",x,y);y+=10;
});
}
client.send();
}