打包之后包缺失module "npm/chance/chance.js" is not defined

线上报下面的错误

onPageNotFound error: page "pages/index" is not found.; at onPageNotFound

Error: onPageNotFound error: page "pages/index" is not found.

at https://lib/WASubContext.js:2:473020

at https://lib/WASubContext.js:2:493391