The file ‘/Skins/B9106EEE-DB03-489D-A19D-8647A55EC15C/control/login_3.ascx’ does not exist.

When going to http://127.0.0.1:8086/login.aspx?ReturnUrl=%2fInterface%2fDefault.aspx:
I would receive the following error:

The file ‘/Skins/B9106EEE-DB03-489D-A19D-8647A55EC15C/control/login_3.ascx’ does not exist.
Source:
WHA.Helm.ControlPanel.dll /login.aspx Page_Load
Stack Trace:
at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at WHA.Helm.ControlPanel.loginpage.Page_Load(Object sender, EventArgs e)
Probing Paths:
C:\Program Files\Parallels\Helm4\ControlPanel\bin

This error was resolved by installing the Skins (Helm Configuration Tool -> Installed Modules -> select the ones under Control Panel Skins).