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Adding custom colors to Foundation Palette causes error (foundation-sites 6.3.1)

I get this error message, when compiling the SCSS:

node_modules/foundation-sites/scss/util/_color.scss
Error: given $key is not available in $foundation-palette

Here is the settings.scss file:

foundation-6

I get this error message, when compiling the SCSS:

node_modules/foundation-sites/scss/util/_color.scss
Error: given $key is not available in $foundation-palette

Here is the settings.scss file: