Symptom

The Unexpected Application Error! is generic, so we'll focus on the different possible error below :

1. Failed to read a named property
2. Loading chunk XXXX failed. (missing: …) and Cannot read properties of undefined (reading 'X')
3. u.matchAll A...] .toArray
4. can be implemented...

1. Failed to read a named property

Solution

This issue is caused by an extension. You can try to solve it with these actions:

• Disable the browser extensions.
• Switch to private navigation.

2. Loading chunk XXXX failed. (missing: …) 

• Cannot read properties of undefined (reading 'X')

Solution 2

It is necessary to clear the browser cache to remove the error.

3. u.matchAll e...] .toArray

Solution 3

As you can see from the URLs below, there is an incompatibility between the toArray method and your browser.

https://caniuse.com/mdn-javascript_builtins_iterator_toarray

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Iterator/toArray#browser_compatibility

Please use a browser that supports this method.