You're using a relative path to the solution file ( MyProject.sln ) but it is being run from a command prompt which is running from %SYSTEMROOT% hence it cannot find the file. Specify the full path to the solution file or, alternatively, ensure the working directory is set to the path to the solution file before running the build command.

The error you originally reported wasn't on the nuget restore call but the msbuild call.

C:\Windows\system32\config\systemprofile\AppData\Local\Jenkins.jenkins\workspace\bash
[bash] $ cmd.exe /C " chcp 1252 & "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin\msbuild.exe" /p:Configuration=Release /p:RunOctoPack=true /p:OctoPackEnforceAddingFiles=true /p:OctoPackPackageVersion=2.0.46 **MyProject.sln** " && exit %%ERRORLEVEL%%
 Use the full path the SLN file here.
											
I should also point out that it appears you're cloning and building your app from %SYSTEMROOT% which is likely because you're running Jenkins as a service. I know nothing about Jenkins but I'm willing to bet that you are not specifying a path when you clone/download your source code and it is defaulting. You should absolutely not being trying to download/modify/build code from %SYSTEMROOT%. This is a protected directory structure for the OS only. Your build process should be cloning/downloading your code to a temporary location such as c:\source or c:\projects or something just like you do on your own system. This has several advantages:
   Security: only admins (which include services running as SYSTEM) has write access (and in some cases read access) to the folders under here and therefore should never be used to store user files like projects.
   Reduces the path length. While Windows supports long file paths some tools may still limit to old value so having many root level folders (e.g. C:\windows\system32\...) is taking up space over something simple like c:\projects
   Putting all your projects into a root folder makes it line up more with how your local builds work
   Putting all your projects into a root folder makes it easier to see what has been built and get to logs if something goes wrong, it also makes cleanup easier over time
While your path is unlikely to be causing you issues right now, at some point I would start pointing figures at the locked down directory when things start to fail for no good reason.
			 
Hi, i configured the path in pipeline correctly but still i have this error :
*MSBUILD : error MSB1009: Project file does not exist. Switch: *  

C:\Users\maftab\source\repos\BizTalkServerOrchestration\BizTalkServerOrchestration.sln  

##[error]Process 'msbuild.exe' exited with code '1'.
Full error : below
"C:\newagent_work_tasks\VSBuild_71a9a2d3-a98a-4caa-96ab-affca411ecda\1.199.0\ps_modules\MSBuildHelpers\vswhere.exe" -version [17.0,18.0) -latest -format json
"C:\newagent_work_tasks\VSBuild_71a9a2d3-a98a-4caa-96ab-affca411ecda\1.199.0\ps_modules\MSBuildHelpers\vswhere.exe" -version [17.0,18.0) -products Microsoft.VisualStudio.Product.BuildTools -latest -format json
"C:\newagent_work_tasks\VSBuild_71a9a2d3-a98a-4caa-96ab-affca411ecda\1.199.0\ps_modules\MSBuildHelpers\vswhere.exe" -version [16.0,17.0) -latest -format json
"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\msbuild.exe" "C:\Users\maftab\source\repos\BizTalkServerOrchestration\BizTalkServerOrchestration.sln" /nologo /nr:false /dl:CentralLogger,"C:\newagent_work_tasks\VSBuild_71a9a2d3-a98a-4caa-96ab-affca411ecda\1.199.0\ps_modules\MSBuildHelpers\Microsoft.TeamFoundation.DistributedTask.MSBuild.Logger.dll";"RootDetailId=bc9c26da-3043-4258-aa51-40deb3467929|SolutionDir=C:\Users\maftab\source\repos\BizTalkServerOrchestration|enableOrphanedProjectsLogs=true"*ForwardingLogger,"C:\newagent_work_tasks\VSBuild_71a9a2d3-a98a-4caa-96ab-affca411ecda\1.199.0\ps_modules\MSBuildHelpers\Microsoft.TeamFoundation.DistributedTask.MSBuild.Logger.dll" /p:VisualStudioVersion="16.0" /p:_MSDeployUserAgent="VSTS_f82be4ec-4c29-4226-9dfa-8eb0a30e25b0_build_8_0"
MSBUILD : error MSB1009: Project file does not exist.
Switch: C:\Users\maftab\source\repos\BizTalkServerOrchestration\BizTalkServerOrchestration.sln
[error]Process 'msbuild.exe' exited with code '1'.