Every AL developer meets the same handful of compiler errors over and over — usually the moment they hit F5 and the build fails. This post collects the ten you are most likely to see in Visual Studio Code when building Business Central extensions, explains what each one actually means, and shows the fix with a short example. Tip: in VS Code, the error code (like AL0432 ) appears in the Problems panel. Searching that exact code is the fastest way to a fix — so each error below is labelled with its code. 1. AL0185 — The name does not exist in the current context The compiler cannot find a variable, method, or object with that name. Almost always a typo, a missing var declaration, or a dependency you forgot to add to app.json . // Error: 'Custmer' does not exist in the current context Custmer.FindFirst(); // typo // Fix: declare it and spell it correctly var Customer: Record Customer; begin Customer.FindFirst(); end; 2. AL0432 — This method is only support...