I'm a novice at programming. And I need help compiling.

Project "C:\Users\bings\Downloads\BattleBit-Community-Server-API-main\BattleBit-Community-Server-API-main\CommunityServerAPI.csproj" on node 1 (default targets).
C:\Users\bings\Downloads\BattleBit-Community-Server-API-main\BattleBit-Community-Server-API-main\CommunityServerAPI.csproj(1,1): error MSB4041: The default XML namespace of the project must be the MSBuild XML namespace. If the project i
s authored in the MSBuild 2003 format, please add xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the <Project> element. If the project has been authored in the old 1.0 or 1.2 format, please convert it to MSBuild 2003 for
mat.
Done Building Project "C:\Users\bings\Downloads\BattleBit-Community-Server-API-main\BattleBit-Community-Server-API-main\CommunityServerAPI.csproj" (default targets) -- FAILED.


Build FAILED.

"C:\Users\bings\Downloads\BattleBit-Community-Server-API-main\BattleBit-Community-Server-API-main\CommunityServerAPI.csproj" (default target) (1) ->
  C:\Users\bings\Downloads\BattleBit-Community-Server-API-main\BattleBit-Community-Server-API-main\CommunityServerAPI.csproj(1,1): error MSB4041: The default XML namespace of the project must be the MSBuild XML namespace. If the project
 is authored in the MSBuild 2003 format, please add xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the <Project> element. If the project has been authored in the old 1.0 or 1.2 format, please convert it to MSBuild 2003 f
ormat.

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.11