REACT Website npm start doesn't start website - reactjs

Question

When I use NPM Start it opens up a webpage in Chrome but after a while, it says
"Aw, Snap! Something went wrong while displaying this webpage."
GitHub Repository for the code. I can't give a small piece fo code because I don't know what is giving the error.
I would like it to run and show my webpages. Not sure why it isn't working. The first time I started the server using NPM start it gave me this page.

Answer 1

The issue is with the Navbar.js
The issue is your class name here was Nav but Nav was also used in the render function. I have renamed Nav to CustomNavbar and imported the bootstrap nav from the npm package.
change your code to this
import React from 'react';
import { Link } from 'react-router-dom';
import Navbar from 'react-bootstrap/Navbar';
import Nav from 'react-bootstrap/Nav';
import { Button, FormControl, Form, NavDropdown } from "react-bootstrap";
export default class CustomNavbar extends React.Component {
render() {
return (
<div>
<Navbar bg="light" expand="lg">
<Navbar.Brand href="#home">Pawsitively Delicious</Navbar.Brand>
<Navbar.Toggle aria-controls="basic-navbar-nav" />
<Navbar.Collapse id="basic-navbar-nav">
<Nav className="mr-auto">
<Nav.Link href="/">Home</Nav.Link>
<Nav.Link href="AboutUs.js">About Us</Nav.Link>
<NavDropdown title="Ingredients" id="basic-nav-dropdown">
<NavDropdown.Item href="./TypesOfDogTreats">Types of Dog Treats</NavDropdown.Item>
<NavDropdown.Item href="AllIngredients.js">Ingredients</NavDropdown.Item>
</NavDropdown>
</Nav>
<Form inline>
<FormControl type="text" placeholder="Search" className="mr-sm-2" />
<Button variant="outline-success">Search</Button>
</Form>
</Navbar.Collapse>
</Navbar>
</div>
);
} // END OF RENDER
} // END OF Navbar

Answer 2

I was having this issue, for me the problem was caused by adding a button component so i deleted a part of my codes
const checkButtonStyle = STYLES.includes(buttonStyle)?buttonStyle:STYLES[0]
const checkButtonSize = SIZE.includes(buttonSize) ? buttonSize: SIZE[0]
try this link for more options on how to solve it
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