I downloaded the Umbraco-CMS code base from github and it did not compile. and gave this error.

Severity Code Description Project File Line Suppression State Error MSB3073 The command "npm ci" exited with code 9009. Umbraco.Web.UI C:\Users\Downloads\Umbraco-CMS-9-contrib (1)\Umbraco-CMS-9-contrib\src\Umbraco.Web.UI\Umbraco.Web.UI.csproj 110

I removed these lines from the project file which allowed it to build,

Target Name="BelleBuild" Exec WorkingDirectory="$(ProjectDir)/../Umbraco.Web.UI.Client/" Command="npm ci" Exec WorkingDirectory="$(ProjectDir)/../Umbraco.Web.UI.Client/" Command="npm run build:skip-tests" Target

CallTarget Targets="BelleBuild" Condition="!Exists('$(BellePath)') and '$(UmbracoBuild)' == ''"

Then it compiles but won't run, and gives this error.

A server error occurred This is most likely due to an error during application startup

Did you know {{installer.feedback}}

//END OF ERROR Copy

Any suggestions on how to get the Umbraco code to run? What am I missing?

Thanks!