how do i get the solution for following error - asp.net

Could not resolve this reference. Could not locate the assembly System.Web.Entity. Check to make sure the assembly exists on disk. If this reference is required by code, you may get compilation errors."
I got this error when suddenly started visual studio from WindowsOS to mac OS.
Is there any solution, anyone knows for this error?

Simple fix: Use the NuGet package System.Web.Http.Common instead of System.Web.Entity

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Android Studio 4 Build ERROR : Execution failed for task ':app:mergeDebugResources'

Hello this is my first time make android program and found this error but the code not have an error point. the error message is below :
Execution failed for task ':app:mergeDebugResources'.
Could not resolve all files for configuration ':app:_internal_aapt2_binary'.
Failed to transform aapt2-4.1.1-6503028-windows.jar (com.android.tools.build:aapt2:4.1.1-6503028) to match attributes {artifactType=_internal-android-aapt2-binary, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for Aapt2Extractor: C:\Users\lenovo.gradle\caches\modules-2\files-2.1\com.android.tools.build\aapt2\4.1.1-6503028\cc838ebadee3649d47e07d029371bc1054e2200d\aapt2-4.1.1-6503028-windows.jar.
> java.io.IOException: Unable to delete directory 'C:\Users\lenovo.gradle\caches\transforms-2\files-2.1\aa8b5888abc00f78a9403248465821cc'
Failed to delete some children. This might happen because a process has files open or has its working directory set in the target directory.
- C:\Users\lenovo.gradle\caches\transforms-2\files-2.1\aa8b5888abc00f78a9403248465821cc\aapt2-4.1.1-6503028-windows
can someone tell me how to fix it ?
i had same problem in linux
tried many ways and asked some question.
finally found out there is file missing named aap2 in build-tools
i couldn't find that file to place it in destination so i deleted whole file and re Download it with sdk manager and if it doesn't work too i guess u should try reinstall android studio
yes its not a good answer but it was all experience i had with this error.

connect Modelica with arduino by firmata

I would like to connect my arduino with modelica by using the firmataprotokoll and the arduinolibrary.
But the compilation always fails because of the error:
LINK : fatal error LNK1181: cannot open input file 'ModelicaFirmata.lib'
Does anybody have an idea how to fix this problem?
The error was caused by a wrong version of the Modelica-Arduino-Library. Instead of downloading the code I should have downloaded the latest release on github.
In addition it is important to choose the right compiler in Modelica (Visual Studio 2015).

Azure Functions Errro - Could not load file or assembly System.Configuration.ConfigurationManager, Version=4.0.3.0

I am working on Azure Functions and these are created in .Net Core version 3.1 whereas the other libraries are written in .Net Framework 4.8. While executing the functions, I am getting following error -
System.Private.CoreLib: Exception while executing function: XXXXXX. System.Private.CoreLib: One or more errors occurred. (The type initializer for 'XXXXX' threw an exception.). XXXX.Service: The type initializer for 'XXXXX.Service.XXXXX' threw an exception. XXXX.Service: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Suggestions would be appreciated.
You can work around the issue by adding the _FunctionsSkipCleanOutput to the project file.
<PropertyGroup>
<_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
</PropertyGroup>
Make sure your package version exists. From this it seems that there is no package version in which you reported an error, check this link:
https://www.nuget.org/packages/System.Configuration.ConfigurationManager/5.0.0-preview.1.20120.5
Click Version History, and you will find:

Build failing on Teamcity

Trying to set up a build on Teamcity, never done this before so I haven't a clue what I'm at. It fails with the following error:
C:\Program Files\dotnet\sdk\2.1.4\Microsoft.Common.CurrentVersion.targets(2659,5): error MSB4062: The "Microsoft.Build.Tasks.ResolveComReference" task could not be loaded from the assembly Microsoft.Build.Tasks.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
Can anybody help me with this? What does this mean and how do I fix it?
I suppose, you are using .net core build command which does not support this target.
Here is a workaround or just use MSBuild for VS2017. Here is a related thread about the issue: https://github.com/dotnet/cli/issues/9558

Dotnet Core NuGet package dependency build issue on Azure DevOps

With no changes at all to source code or pipelines, I am now experiencing an issue where none of my build pipelines work anymore in Azure DevOps. The package that is being referenced isn't a dependency for this project, nor has it ever been. I can't work out what's causing this or how I can go about troubleshooting.
2018-11-26T10:25:14.2812751Z Restoring packages for C:\Agent\_work\19\s\OrchestrateIT.Web\OrchestrateIT.csproj...
2018-11-26T10:25:14.7577515Z C:\Program Files\dotnet\sdk\2.1.400\NuGet.targets(114,5): error : Unable to load the service index for source https://orchestrate-it.pkgs.visualstudio.com/_packaging/Shared_DBUpdate/nuget/v3/index.json. [C:\Agent\_work\19\s\OrchestrateIT.DataImportScheduler\OrchestrateIT.DataImportScheduler.csproj]
2018-11-26T10:25:14.7577910Z C:\Program Files\dotnet\sdk\2.1.400\NuGet.targets(114,5): error : Response status code does not indicate success: 401 (Unauthorized). [C:\Agent\_work\19\s\OrchestrateIT.DataImportScheduler\OrchestrateIT.DataImportScheduler.csproj]
2018-11-26T10:25:14.7579439Z 0 Warning(s)
2018-11-26T10:25:14.7579628Z 1 Error(s)
2018-11-26T10:25:14.7579743Z
2018-11-26T10:25:14.7579902Z Time Elapsed 00:00:02.18
2018-11-26T10:25:14.7906687Z ##[error]Error: C:\Program Files\dotnet\dotnet.exe failed with return code: 1
Local (manual) build works fine. I have already tried clearing Nuget cache and VSTS agent cache. A quick workaround might be to solve the authorisation issue (even though the package isn't required) however I'm not sure how to go about doing this.
Any advice would be greatly appreciated.
Even though my Personal Access Token had not expired, for some reason I needed to remove and add this package back to my sources with the same PAT. This resolved the authentication issue and therefore resolved the build issue.
It is still unclear to me as to why this package is being considered as a dependency for this project though.

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