Common Error in React js

Error:ADD_QUESTION_BEGIN' is not defined

Solution
In reducer.js
import ADD_QUESTION_BEGIN in reducer.js

import {
  ADD_QUESTION_ERROR,
  ADD_QUESTION_SUCCESS,
  ADD_QUESTION_BEGIN,
} from "./actions"

in action.js

export const ADD_QUESTION_BEGIN = "ADD_QUESTION_BEGIN"

Error: Uncaught (in promise) TypeError: addQuestion is not a function
In appcontext.js

<AppContext.Provider
      value={{
      addQuestion
          {children}
    </AppContext.Provider>
  )

Error:state.clients.result is undefined

in reducer.js mention clients variable

ERROR:Feedback is not defined

============or===================

if (!Feedback || Feedback.length === 0) {
  return <p>No feedback found.</p>;
}

ERRORS
Cannot read properties of undefined (reading 'length')
TypeError: Cannot read properties of undefined (reading 'length'

my code is

<h5>Total Feedback:{myfeedback.length} </h5>

solution

<h5>Total Feedback:{myfeedback?myfeedback.length:null} </h5>

How to debug if output in server console not shown

in server console

solution:

CASE2: how to debug not show output

my code is
In client side

router

error :

output:item: '[object Object]'

Solution
in appcontext

controller function

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