STRAPI:运行命令develop时出错:未定义

我无法npm startSTRAPI，它显示以下错误。我正在使用STRAPI 3.1.3

> my-project@0.1.0 strapi /Users/mac/Documents/Development_env/jobBackend/my-project
> strapi "develop"
Error while running command develop: undefined
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-prject@0.1.0 strapi: `strapi "develop"`    npm ERR! Exit status 1
npm ERR! 
macs-Air:my-project mac$ npm start
> my-project@0.1.0 start /Users/mac/Documents/Development_env/jobBackend/my-project
> strapi start
Error while running command start: undefined
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-project@0.1.0 start: `strapi start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the my-project@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/mac/.npm/_logs/2020-08-13T17_02_08_854Z-debug.log