Hi @Mario_Ghersi,
your code on the screenshot looks good, but red highlighting of 29-d line means that there is some problem with this file. When you open this file, do you see any error message below the code or when hovering the mouse over the 29-d line? That would help us to identify the problem and help you to resolve it. Also, did you install image-js module before?
Regards,
Stanislaw