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Thanks for the fast reply!

Didn't know I should post a minimal example.
I'll do it the next time!

Thanks and by

Hello everyone,

I'm currently writing my master thesis and decided to do this with TeXmaker. I'm a total newcomer to LaTeX and TeXmaker and still make a lot of mistakes. This is the critical line:
\newcommand{\photons}{\mu $ mol photons/m^{2}s $}
Every time I use the new command \photons I get ...