react router v4 error Link component

Mamen Source

i have component that import a Link from react-router-dom

import React, { Component } from 'react';
import { Link } from 'react-router-dom';

class Sidebar extends Component{

  render() {
    return (
      <div className="be-left-sidebar">
        <div className="left-sidebar-wrapper"><a href="#" className="left-sidebar-toggle">Blank Page</a>
          <div className="left-sidebar-spacer">
            <div className="left-sidebar-scroll">
              <div className="left-sidebar-content">
                <ul className="sidebar-elements">
                  <li className="divider">Menu</li>
                  <li className="parent"><a href="#"><i className="icon mdi mdi-home" /><span>Home</span></a>
                    <ul className="sub-menu">
                      <li><Link to='/'>Home</Link>

          <div className="progress-widget">
            <div className="progress-data"><span className="progress-value">60%</span><span className="name">Current Project</span></div>
            <div className="progress">
              <div style={{width: '60%'}} className="progress-bar progress-bar-primary" />


export default Sidebar;

then console.log shows an error

  • Warning: Failed context type: The context router is marked as required in Link, but its value is undefined.
  • Cannot read property 'history' of undefined


i am new in react and i am using react router v4.1.1

anyone can help me? thanks



answered 1 year ago Vishal Gulati #1

In React router v4, we have Switch, Route and Link components that we import from react-router-dom and configure our router as follows:

import { Switch, Route, Link } from 'react-router-dom';

    <li onClick={this.props.goToDefault}><Link to={'/'}>Go To Default</Link></li>
    <li onClick={this.props.goToSub1}><Link to={'/left-sub1'}>Go To One</Link></li>
    <li onClick={this.props.goToSub2}><Link to={'/left-sub2'}>Go To Two</Link></li>
    <Route exact path='/' component={LeftSubDefault} />
    <Route path='/left-sub1' component={LeftSubOne} />
    <Route path='/left-sub2' component={LeftSubTwo} />

In the app.js or whatever your entry file is. Wrap your App component inside BrowserRouter as follows:

import { BrowserRouter } from 'react-router-dom';

    <App />

Here is a wonderful article that may help.

answered 1 year ago philippsh #2

Make sure you have your component appearing inside <Router> component.

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