/Javascript/Node.js/Cannot read property 'find' of undefined nodejs

Cannot read property 'find' of undefined nodejs

router.get('/', (req, res) => {
    PostUser.find((err, docs) => {
        if (!err) res.send(docs)
        else console.log('Error while retrieving all records : ' + JSON.stringify(err, undefined, 2))
    })
})

Cannot read property 'find' of undefined

TypeError: Cannot read property 'find' of undefined    at C:\Users\tejas\OneDrive\Desktop\TABLE_UI\routes\user.js:10:14    at Layer.handle [as handle_request] (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\layer.js:95:5)    at next (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\route.js:137:13)    at Route.dispatch (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\route.js:112:3)    at Layer.handle [as handle_request] (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\layer.js:95:5)    at C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:281:22    at Function.process_params (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:335:12)    at next (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:275:10)    at Function.handle (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:174:3)    at router (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:47:12)    at Layer.handle [as handle_request] (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\layer.js:95:5)    at trim_prefix (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:317:13)    at C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:284:7    at Function.process_params (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:335:12)    at next (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\router\index.js:275:10)    at expressInit (C:\Users\tejas\OneDrive\Desktop\TABLE_UI\node_modules\express\lib\middleware\init.js:40:5)

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