Error Building: can't evaluate field IsServer in type interface {}

[Zackariyya]

cd src-4/
hugo
Start building sites … 
hugo v0.140.2+extended linux/amd64 BuildDate=unknown

ERROR deprecated: .Site.IsMultiLingual was deprecated in Hugo v0.124.0 and will be removed in Hugo 0.141.0. Use hugo.IsMultilingual instead.
ERROR EXECUTE-AS-TEMPLATE: failed to transform "/css/theme-auto.css" (text/css): template: /css/theme-auto.css:30:8: executing "/css/theme-auto.css" at <site>: can't evaluate field IsServer in type interface {}
Built in 2459 ms
Error: error building site: EXECUTE-AS-TEMPLATE: failed to transform "/css/theme-auto.css" (text/css): template: /css/theme-auto.css:30:8: executing "/css/theme-auto.css" at <site>: can't evaluate field IsServer in type interface {}

cd ../src-3
hugo
Start building sites … 
hugo v0.140.2+extended linux/amd64 BuildDate=unknown

ERROR deprecated: .Site.IsMultiLingual was deprecated in Hugo v0.124.0 and will be removed in Hugo 0.141.0. Use hugo.IsMultilingual instead.
ERROR The "youtube" shortcode requires an id argument. See "/home/zackariyyasattaur/CODING_FILES/Godot/Docs/godot_recipes-master/src-3/content/kyn/rigidbody2d.md:172:1"
ERROR The "youtube" shortcode requires an id argument. See "/home/zackariyyasattaur/CODING_FILES/Godot/Docs/godot_recipes-master/src-3/content/recipes/singleton.md:66:1"
ERROR EXECUTE-AS-TEMPLATE: failed to transform "/css/theme-auto.css" (text/css): template: /css/theme-auto.css:30:8: executing "/css/theme-auto.css" at <site>: can't evaluate field IsServer in type interface {}
Total in 3317 ms
Error: error building site: EXECUTE-AS-TEMPLATE: failed to transform "/css/theme-auto.css" (text/css): template: /css/theme-auto.css:30:8: executing "/css/theme-auto.css" at <site>: can't evaluate field IsServer in type interface {}