problem with redis client

[thehamdiaz]

can someone help me fix this issue:

TypeError: client.hlen is not a function
    at /usr/app/webui.js:19:12
    at Layer.handle [as handle_request] (/usr/app/node_modules/express/lib/router/layer.js:95:5)
    at next (/usr/app/node_modules/express/lib/router/route.js:144:13)
    at Route.dispatch (/usr/app/node_modules/express/lib/router/route.js:114:3)
    at Layer.handle [as handle_request] (/usr/app/node_modules/express/lib/router/layer.js:95:5)
    at /usr/app/node_modules/express/lib/router/index.js:284:15
    at Function.process_params (/usr/app/node_modules/express/lib/router/index.js:346:12)
    at next (/usr/app/node_modules/express/lib/router/index.js:280:10)
    at expressInit (/usr/app/node_modules/express/lib/middleware/init.js:40:5)
    at Layer.handle [as handle_request] (/usr/app/node_modules/express/lib/router/layer.js:95:5)