How to get better error messages when developing flutter for web - flutter-web

When trying to start a working flutter mobile app as web app I got the error message:
[SEVERE ] 16:37:02 - XXX - MissingPlug…ime/patch/async_patch.dart 166:15
and found nothing helpfull in the web on that error.
But I found out that it is because we are using the package_info package which is not compatible with flutter for web.
Is there any way to get better error messages - maybe telling the file/line with the problem or anything which makes it easier to find the problem?

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An error occurred in the application and your page could not be served.?

I was trying to deploy my mern project my always i got this error
please help me to find out this issue (https://i.stack.imgur.com/oVacD.png)
I found two web pages that should help you in debugging your code here:
Causes of Heroku H10 App Crashed Error and How to Solve Them
Heroku Error Code H10
The first is more detailed and the second links to an anchor on a list of error codes. If you're using Heroku, it's worth bookmarking that entire page. I'm interested to know what your specific issue turns out to be.

Does Error k come from Angular or Electron?

I am using Angular 10 in my Electron app and after building a release version of my app I see the following errors below in the Chrome Inspector. Unfortunately I have no idea if it comes from Electron or Angular, or what it even tries to tell me. The non-production build just runs fine without the error.
Unfortunately I can't really see the stacktrace. Does anyone know what it is, or has a good approach how to pinpoint the cause of it? Thanks!
You can click on the arrow next to 'k'. It gives you a more detailed info about the error and what might have happened.

Cannot GET / error

looked for couple of hours, on how to solve that, but no luck.
I am using VS 2017 preview edition, and trying to open ASP.NET core 2.0 web application, that uses Angular template
when i open the site (f5 or ctrl-f5), the web-browser getting opened with the message
Cannot GET /
I don't know what causing that and how to fix that, tried to clean/rebuild/restart VS/change project port number/restart the computer, what else can I do to solve that?
Depending on what error you have in the client application, the server might not start at all. Local errors like undeclared locals are seldom a problem.
Usually, the web server does not start when a dependency of the module marked as bootstrap is missing, like, for example `entryComponents'.
Another thing that can cause the boostrap to fail, is a missing file: in this case you should have a look at templateUrl and styleUrls.
Manually compiling via ng build (or better ng build --prod) will point you to the offending code.

Uncaught (in promise): The message port closed before a response was received

So before the question I wanna point out that the only thing I could find on this issue was on this stackoverflow question. This issue suggest that this was an issue with wappalyzer, and it was fixed in version 4.0.1. however I am using wappalyzer version 5.1.4 and is up to date with this.
I am building a web-app based on the MEAN-stack, everything worked as intended for a long time, until this error kept poping up in my google-chrome console:
Everytime i would click in my app header, and use my front-end routing to load up different components / modules this error appears, however I dont see any issue with what the web-app presents to me (it's not like I am missing data)
More details on the error:
I have no idea whats going on, or where this issue comes from.
This was due to a failing plugin.
Disable all plugins, and enable them one at a time to find failing chrome extensions.
In this case it was the wappalyzer extension.

How to get Windows azure to give me more useful error information

I've been experimenting with the new windows azure website feature, and im getting http 500 internal server errors, but the logs are giving me very generic messages, I "think" its a problem with database connections, as everything runs fine locally. Is there some way to get more usefull error messages from azure ?
Im using C# .net 4.0 and mvc 3
Can you adjust the custom errors section in the web.config to give you detailed errors all the time?

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