REact routing not work

Hello,

i am new for React.js. I need your help...
i have created login, registration, forgot and Dashboard pages.
and route worked perfectly

In dashboard i have created three components Like Navarea wrapper(content display area) and Sidebarmenu

now i want to route Navarea links and component display in wrapper(content display area) like About page

I am trying but Navarea links not working i have share below screen

could you help me where i am doing wrong