node:internal/modules/cjs/loader:936 throw err； 求解决

D:\\ethereum\\Dkfuwq>node app.js
node:internal/modules/cjs/loader:936
  throw err;
  ^

Error: Cannot find module \’safe-buffer\’
Require stack:
– D:\\ethereum\\Dkfuwq\\node_modules\\Koa\\node_modules\\content-disposition\\index.js
– D:\\ethereum\\Dkfuwq\\node_modules\\Koa\\lib\\response.js
– D:\\ethereum\\Dkfuwq\\node_modules\\Koa\\lib\\application.js
– D:\\ethereum\\Dkfuwq\\app.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object. (D:\\ethereum\\Dkfuwq\\node_modules\\Koa\\node_modules\\content-disposition\\index.js:23:14)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19) {
  code: \’MODULE_NOT_FOUND\’,
  requireStack: [
    \’D:\\\\ethereum\\\\Dkfuwq\\\\node_modules\\\\Koa\\\\node_modules\\\\content-disposition\\\\index.js\’,
    \’D:\\\\ethereum\\\\Dkfuwq\\\\node_modules\\\\Koa\\\\lib\\\\response.js\’,
    \’D:\\\\ethereum\\\\Dkfuwq\\\\node_modules\\\\Koa\\\\lib\\\\application.js\’,
    \’D:\\\\ethereum\\\\Dkfuwq\\\\app.js\’
  ]
}