Just to say InDesign is working again, and I don't know why. I restarted my computer when the Error 4 occurred initially, and that didn't work. Since then, I quit InDesign and opened the file from within InDesign, and it opened. I did this because on my work computer (my issue was on my home computer) I got an Error 14 (I don't have further details of that error), and when I closed InDesign and opened it again, and opened the file from within the app, it opened. As a remark worth making, InDesign has become very unstable in recent months. As a long-time user I'm qualified to say this. I share files in work with two other people. It is vital InDesign only update the app when absolutely essential, as each update risks problems occurring. We are professional users, so interrupted workflow wastes time, and time is money, and deadlines are our business. I'm asking that emphasis be placed on the professional users' essential stability. When I get upset with problems, it doesn't mean I'm not in appreciation for a great piece of design software, it's only that no matter how fab a piece of software, if it's not reliable it's not for professionals. Being able to open a file – a new file or a file a few years old – is one of the most basic requirements. If there are regular issues with this basic requirement, than as manager of the design department, I'm obliged to look to alternatives.
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