Why is npm run dev not working?

Question

npm

Hello) A few minutes ago I cloned gutenberg from github - https://github.com/WordPress/gutenberg , and then ran the scripts as written in the documentation:
npm ci
npm build
npm run dev
But the npm run dev script does not work:

[0] [./packages/block-serialization-default-parser/build-module/index.js] 11.3 KiB {blockSerializationDefaultParser} [built]
[0] [./packages/block-serialization-spec-parser/parser.js] 46.9 KiB {blockSerializationSpecParser} [built]
[0] [./packages/blocks/build-module/index.js] 637 bytes {blocks} [built]
[0] [./packages/compose/build-module/index.js] 2.16 KiB {compose} [built]
[0] [./packages/core-data/build-module/index.js] 4.6 KiB {coreData} [built]
[0] [./packages/customize-widgets/build-module/index.js] 1.45 KiB {customizeWidgets} [built]
[0] [./packages/data-controls/build-module/index.js] 3.67 KiB {dataControls} [built]
[0] + 3161 hidden modules
[0] wp-scripts start exited with code 0

During normal operation, there is no this line -

[0] wp-scripts start exited with code 0

npm-v 6.14.11
node-v 14.16.0
What is this error? How to fix ?

Answer 1

Where is the error? Don't know the meaning of exit codes?
https://askubuntu.com/questions/892604/what-is-the...