Stylus ParseError: erwaart "indent", krut "outdent"

Stylus ParseError: erwaart "Indent", krut "outdent"

Unable to compile Stylus file app/css/app.styl to CSS: ParseError: app/css/provider.styl:22
   18|  padding-top: 20px
   19|  text-align: center
   20|  border-bottom: 1px solid white
   21|  margin-bottom: 25px
 > 22| 
   23| .aclass
   24|  display: none
   25| 

expected "indent", got "outdent"

Wat maachen ech hei falsch? Merci fir all Informatioun iwwer dëse Feeler!