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client/src/App.js

@@ -19,9 +19,10 @@ function App() {
   return (
     <div>
       {/* {console.log("match.params=",match.params(product))} */}
-      <MainNav />
-      <SubNav />
+
       <Router>
+        <MainNav />
+        <SubNav />
         <Switch>
           <Route exact path="/" component={Home} />
           <Route path="/login" component={Login} />

client/src/Pages/ProductRegist.js

@@ -3,7 +3,6 @@ import { Redirect } from 'react-router-dom';
 import { Row, Col, Button, Form, Container, Alert } from 'react-bootstrap';
 import axios from 'axios';
 import catchErrors from '../utils/catchErrors';
-import { Redirect } from 'react-router-dom';
 
 let color = {}
 let preColors = []