Error : File `l3backend-pdfmode.def' not found. }

Question

I am trying to compile a .tex document into a pdf in TexStudio (and I have also tried in MikTex) and the following error is outputted File l3backend-pdfmode.def not found. I have tried downloading 13backend package but no luck. Do I need to place the package in a specific folder?

Answer 1

I had the same problem, turned out my miktex library was out-of-date

I opened "miktex console" and updated it.