added catch block

src/index.js

@@ -5,6 +5,7 @@ const { PuppeteerOptions } = require('./wrapper/puppeteerOptions')
 const argv = require('yargs/yargs')
 const { hideBin } = require('yargs/helpers')
 const { Cookies } = require('./helper/cookies')
+const { exit } = require('yargs')
 
 const arguments = argv(hideBin(process.argv))
   .command('$0 <source> [output]', 'Generate PDF files from URL using puppeteer', (argv) => {
@@ -120,4 +121,9 @@ const arguments = argv(hideBin(process.argv))
 
   const options = new PuppeteerOptions(arguments);
   const puppeteerWrap = new PuppeteerWrapper(arguments.source, options, cookies)
-  puppeteerWrap.printPDF()
\ No newline at end of file
+  
+  puppeteerWrap.printPDF().catch((err) => { 
+    //console.error(err.message)
+    print(err.message)
+    exit(1)
+  })