Cannot find module 'socket.io-redis'

I’ve just upgraded wappler from 3.9.x to 4.6.x and am getting the following in the log - server crashes as a result.

Any ideas on what needs to be changed to get back up and running … thanks

Error: Cannot find module ‘socket.io-redis’
Require stack:

• /opt/node_app/lib/setup/sockets.js
• /opt/node_app/lib/server.js
• /opt/node_app/index.js
  at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)
  at Function.Module._load (internal/modules/cjs/loader.js:667:27)
  at Module.require (internal/modules/cjs/loader.js:887:19)
  at require (internal/modules/cjs/helpers.js:74:18)
  at module.exports (/opt/node_app/lib/setup/sockets.js:15:30)
  at Object. (/opt/node_app/lib/server.js:47:12)
  at Module._compile (internal/modules/cjs/loader.js:999:30)
  at Object.Module._extensions…js (internal/modules/cjs/loader.js:1027:10)
  at Module.load (internal/modules/cjs/loader.js:863:32)
  at Function.Module._load (internal/modules/cjs/loader.js:708:14) {
  code: ‘MODULE_NOT_FOUND’,
  requireStack: [
  ‘/opt/node_app/lib/setup/sockets.js’,
  ‘/opt/node_app/lib/server.js’,
  ‘/opt/node_app/index.js’