break-1 is not a set breakpoint variable

[holisticnetworking]

Error coming up as I'm compiling CSS.

WARNING: break-1 is not a set breakpoint variable
         on line 29 of ../HNReactive/node_modules/sassline/assets/sass/sassline-base/_mixins.scss, in mixin `breakpoint`
         from line 107 of ../HNReactive/node_modules/sassline/assets/sass/sassline-base/_typography.scss
         from line 6 of ../HNReactive/node_modules/sassline/assets/sass/_sassline-base.scss
         from line 5 of ../HNReactive/node_modules/sassline/assets/sass/style.scss
         from line 19 of ../HNReactiveChild/Library/scss/app.scss```

Compiling using Gulp Sass.  Thanks.