PDF creator in ionic 2

Hi i am trying to create a pdf file and save it to my local storage using cordova-file-plugin and pdfmake
When i try this i get an error Roboto-regular.ttf file is not available could some one help me tor fix this issue or suggest tutorial were ionic has in pdf creation, viewing, saveing to local storage

html_pdt() {
	var docDefinition = {
		content: [
				table: {
					body: [
						['Tools', 'Experience'],
						[this.exp, this.experience],
						[{ text: 'Bold value', bold: true }, this.exp, this.experience]
			{ text: 'Date', style: 'subheader' }, this.date,
			{ text: 'Signature', style: 'subheader' }, this.signature,
	pdfmake.createPdf(docDefinition).getBuffer(function (buffer) {
		var utf8 = new Uint8Array(buffer); // Convert to UTF-8... 
		var binaryArray = utf8.buffer; // Convert to Binary...
		this.File.writeFile(cordova.file.dataDirectory, "example.pdf", binaryArray, true)
			.then(function (success) {
				console.log("pdf created");
			}, function (error) {

error in my console
> ERROR Error: File ‘Roboto-Regular.ttf’ not found in virtual file system

Hello, you can check this source code at codecanyon