Failed Building LaTeX (code 12) - solution?

Hi!

Why do I get this error message when I try to ‘build LaTex’?
How do I fix it?

This is a screenshot of what happens:

Three questions –

  1. What operating system are you running?
  2. What version of TeX/LaTeX have you installed?
    Particularly, is latexmk installed?
  3. What does the Show build log show?

Thanks for getting back to me!
I managed to solve the problem, so it’s all good now!