Encountered a compiling error when attempting to watch for changes on the ./folder directory using the

An unexpected exception occurred:
NullError: method 'length' not found on null


File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 8583:23   Function: tF.eA
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 8585:28   Function: tF.aB
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 8285:14   Function: kX.bV
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 10318:36   Function: <fn>
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 2912:71   Function: DR.a
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 3147:23   Function: DR.$2
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 3145:26   Function: Ca.dart.Ca.$2  
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 4255:23   Function: AV.ud
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 3391:51   Function: dM.tn
File: /usr/local/lib/node_modules/sass/sass.dart.js Line: 3633:7    Function: Aq.$0

Looking for assistance with this issue. I encountered this error while running the command 

sass --watch ./src/sass ./src/css
.

cssnode.jsnpmwebpacksass

Answer №1

Make sure to include a colon : when specifying the source and destination in the command 

sass --watch ./src/sass:./src/css

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