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CSS Advanced Sass Advanced Functions Randomly Generating Graphics

random() function does not work

Hallo I have write the whole tutorial in sassmeister and it work perfectly. but if i write the random function local on my pc it does not work. i get this error in my terminal:

Warning: /Users/I/Documents/Projecten/test/scss/Layout/index:8: argument `$red` of `rgba($red, $green, $blue, $alpha)` must be a number
Backtrace:
    /Users/I/Documents/Projecten/test/scss/Layout/index:8, in function `rgba`
    /Users/I/Documents/Projecten/test/scss/Layout/index:8
 Use --force to continue.

does someone now this error and can help my?