Sass error

[sirius2145]

c:\WEB\Art>jekyll serve --watch
Configuration file: c:/WEB/Art/_config.yml
Source: c:/WEB/Art
Destination: c:/WEB/Art/_site
Incremental build: disabled. Enable with --incremental
Generating...
Conversion error: Jekyll::Converters::Sass encountered an error while converting 'assets/css/all.sass':
Error: Invalid CSS after "$accent": expected 1 selector or at-rule, was ": #c99065;" on line 15:1 of all.sass >> $accent: #c99065; ^
------------------------------------------------
Jekyll 4.0.0 Please append --trace to the serve command
for any additional information or backtrace.
------------------------------------------------

c:\WEB\Art>

[sirius2145]

Hi guys can you please help me. Can not understand what is the reason for this error:

"Conversion error: Jekyll::Converters::Sass encountered an error while converting 'assets/css/all.sass':
Error: Invalid CSS after "$accent": expected 1 selector or at-rule, was ": #c99065;" on line 15:1 of all.sass >> $accent: #c99065; ^"