combine_pdf | Pure ruby library to merge PDF files | Document Editor library

I have been tinkering with Combine_PDF to add a watermark to uploaded documents. I have managed to get it to work combining files locally hosted or through using net/http requests. I would like for it to watermark the file stored in active storage when it is downloaded by a user. I keep getting this error in the terminal:

I am more of a Java programmer and still somewhat new to development (2 years or so, can write Java code & web apps just fine) however the company I work for has 4 Rails applications and was asked to get this application working called CtrlPanel. I have been having to learn Ruby on Rails in order to help get this issue with this app fixed and get it working.

I have been working on this problem for over a week all day long every day and nothing I do is fixing it.

I fixed everything to the point the app comes up, web server runs serves the pages but all views are white screens as long as this application.html.haml file is present. I re-wrote the file with very basic bootstrap and it sort of works but nothing looks right. The problem seems to stem from 1 single like that simply says: = javascript_include_tag "application"

I have been all over the internet and have tried every single fix from changing coffee-script-source to v1.8.0 as I read Windows has an issue with newer rails and that file, I have tried every variation of changing it from application to default, and every type of ending you can think of no matter what I do it gives me this error message which I can not seem to find.

I am not even sure WHAT that line does, I assume it has to do with the new Google Maps API and I verified the key is valid and it was working before.

This is the error is it giving it says the line with "= javascript_include_tag" "application" giving error ExecJS::RuntimeError at / SyntaxError: [stdin]:1:1: unexpected //=

I am running a PC on Windows 10 20H2 x64 UEFI ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x64-mingw32] Rails 6.1.3

(I did also install Ubuntu on another machine and it gives the exact same error, also gives the same error on another Windows machine)

The app is working IF I delete the "application.html.haml" file and put in a skeleton basic version all of the other views start working but of course none of them look right no menus no bootstrap no nothing.
Here is the application.html.haml file.

I am using WickedPDF in a Rails 6 project to generate PDFs from HTML, and then combine them with prefilled PDF forms. The WickedPDF generated PDFs are split into two sections, each of which must be combined with a form. The forms must appear at the beginning of their respective sections.

I have attempted to generate two PDFs with WickedPDF and then combine them with the prefilled forms using combine_pdf in the appropriate order.

The render_ar_docs and render_gl_docs both work as expected when I visit their routes individually: they generate and save the expected PDF. However, when I call them sequentially in the print_complete_docs action, the resulting PDFs are a single blank page.

How can I generate multiple PDFs from a single action?

Thank you for your help.

I'm trying to deploy my Rails 5.0 on heroku after a bundle update. I'm blocked by an issue on assets:precompile