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You have net6.0 target framework which is still not released while you have installed EF6 which is a previous iteration Entity Framework (mainly used with legacy .NET Framework projects) and you also have EF Core (a modern iteration of it) but older version - 5.0 (which you are actually using for your context, see the using Microsoft.EntityFrameworkCore; statements there).

Try removing EntityFramework package and installing preview version of Microsoft.EntityFrameworkCore.SqlServer (possibly just updating to the latest 5 version also can help) and either removing completely or installing preview version of Microsoft.EntityFrameworkCore.Design. (Also I would recommend to update your SDK to rc and install rc versions of packages).

Or try removing the reference to EntityFramework (not Core one) and changing target framework to net5.0 (if you have it installed on your machine).

As for why do you see this exception - I would guess it is related to new methods added to Queryable in .NET 6 which made one of this checks to fail.

TL;DR

As mentioned in the comments - update EF Core to the corresponding latest version (worked for 5.0 and 3.1) or update to .NET 6.0 and EF Core 6.

Here are some references that might help:

Try installing Truffle via PowerShell in Admin mode (very important that you're in Admin mode)

You'll need to allow scripts to run as an Admin in PowerShell. To do this, here are some references in the threads in Stack Overflow:

Enable Execution of PowerShell Scripts

PowerShell Scripts

Cannot Install Truffle

I ran the command Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Bypass -Force in PowerShell to get this to work, but please reference the threads above before doing this.

I had the same issue and solved it downgrading numpy to version 1.20.3 by:

I have been facing this same issue for some time now. the same setup is working nicely in a mac with intel chip. But i have even done a resetup of my system, m1 mac still throws the same error.

I had same issue when i was using pytube 11.0.0

so found out that there is a regular expression filter mismatch in pytube library in cipher.py class

function_patterns = [

From the terminal messages, you are installing an old version of node-gyp (node-gyp@3.8.0). From a quick search, it seams that this version requires python 2. Python 2 should be present in Big Sur. Properly setting the path, should work:

How about this? flutter pub cache repair

Keep it easy.
Certs inside your application are complex - they are hard to manage and you will get problems to run your application in a modern cloud environment (start new environments, renew certs, scale your application, ...).

Simple conclusion: Dont implement any certs.

As Mike already pointed out in the comments: WebSockets are just upgraded HTTP(S) connections. A normal webserver (nginx, apache) takes care about the certs. It can be done in kubernetes (as ingress-controller) or with a "bare-metal" webserver.
Both of them should act as a reverse-proxy. This means: Your java-application doesn't know anything about certs. It has just unencrypted connections - like in your code on port 6868.
But the client will not use this port. 6868 is only internally reachable.

The client will call your reverse-proxy at the normal HTTPS port (=443). The reverse-proxy will forward the connection to your java-application.

Here some links for further information:

• nginx reverse-proxy
• nginx reverse-proxy for websocket
• tutorial for java behind reverse-proxy
• LetsEncrypt for automatic and free certs

When you run codesign -d --verbose=5 your_app.app, how many lines do you see in the "page size" block? Do you see a -7= line? If so, does it contain no value (or 0)?

If there is no -7= line (or it has no value) then your app does not include the DER entitlements and you will need to re-sign. You might need a new provisioning profile.