Problem:
You want to compile a LaTeX file containing CircuiTikZ code but you get the following error:
Error: I do not know the key '/tikz/elmech'
Solution:
First, be sure that the circuitikz
package is included, i.e. there’s a line like
\usepackage{circuitikz}
in your LaTeX file.
If that is the case, you likely have an outdated CircuiTikZ version (elmech
is in TeXLive 2016+). Depending on your distribution, there are several ways to update CircuiTikZ: