atom-ide-package failing to load due to theme

[skipzero]

Apparently this is an issue in many themes, for the seti theme, it's cause is in ui-variables.less, line 158 @seti-font-family: 'Roboto', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
To circumvent the error, I've just copied the line and took off seti-, declaring the variable as font-family: 'Roboto', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;...
The IDE is looking for a global @font-family variable and not a theme specific one. Happy to submit a PR if you'd like, or you can just edit that line or add another as you see fit.