I can't install a skin because I get a message it's already installed. I know it's not installed because it's not in the list of skins. In that page there's a next link which is enabled. Clicking on it does nothing. First DNN is reporting it's installed when it's not. Second, DNN should let me proceed to overwrite even if it's installed. Just like when it does this with modules. This is in DNN 5.4.1.

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Error message:

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If you have reached this page it is because the installer needs to gather some more information, before proceeding. The package is already Installed.

It's a skin from a skin pack. All the other skins from the same pack installed correctly except for this one giving the error. They all have the same structure.

It's gives the error below when trying to install the skin using mode=installresources url

[NullReferenceException: Object reference not set to an instance of an object.]
   DotNetNuke.Services.Installer.Installers.SkinInstaller.get_RootPath() +31
   DotNetNuke.Services.Installer.Installers.SkinInstaller.get_PhysicalBasePath() +16
   DotNetNuke.Services.Installer.Installers.SkinInstaller.ProcessFile(InstallFile file, XPathNavigator nav) +212
   DotNetNuke.Services.Installer.Installers.FileInstaller.ReadManifest(XPathNavigator manifestNav) +207
   DotNetNuke.Services.Installer.Installers.InstallerFactory.GetInstaller(XPathNavigator manifestNav, PackageInfo package) +188
   DotNetNuke.Services.Installer.Installers.PackageInstaller.ReadComponents(XPathNavigator manifestNav) +445
   DotNetNuke.Services.Installer.Installers.PackageInstaller.ReadManifest(XPathNavigator manifestNav) +1439
   DotNetNuke.Services.Installer.Installers.PackageInstaller..ctor(String packageManifest, InstallerInfo info) +192
   DotNetNuke.Services.Installer.Installer.ProcessPackages(XPathNavigator rootNav) +309
   DotNetNuke.Services.Installer.Installer.ReadManifest(Stream stream) +318
   DotNetNuke.Services.Installer.Installer.ReadManifest(Boolean deleteTemp) +93
   DotNetNuke.Services.Installer.Installer..ctor(Stream inputStream, String physicalSitePath, Boolean loadManifest, Boolean deleteTemp) +96
   DotNetNuke.Services.Upgrade.Upgrade.InstallPackage(String strFile, String packageType, Boolean writeFeedback) +215
   DotNetNuke.Services.Upgrade.Upgrade.InstallPackages(String packageType, Boolean writeFeedback) +216
   DotNetNuke.Services.Install.Install.InstallResources() +106
   DotNetNuke.Services.Install.Install.Page_Load(Object sender, EventArgs e) +336
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627