clean web page

[xtechnical]

Uncaught ReferenceError: PropTypes is not defined
at eval (Leads.js:50)
at Module../leadmanager/frontend/src/components/leads/Leads.js (main.js:169)
at webpack_require (main.js:20)
at eval (Dashboard.js:6)
at Module../leadmanager/frontend/src/components/leads/Dashboard.js (main.js:145)
at webpack_require (main.js:20)
at eval (App.js:7)
at Module../leadmanager/frontend/src/components/App.js (main.js:121)
at webpack_require (main.js:20)
at eval (index.js:2)