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Hi guys I cannot install wordpress i receive this error

 

– ApplicationInstallationError
– PackageInstallationError:Object reference not set to an instance of an object.; at SolidCP.Server.Code.WpiHelper.InstallApplication(String appId, List`1 updatedValues, String languageId, EventHandler`1 installStatusUpdatedHandler, EventHandler`1 installCompleteHandler, String& log, String& failedMessage) at SolidCP.Providers.Web.WPIWebApplicationGallery.WPIApplicationGallery.InstallApplication(Int32 UserId, String webAppId, List`1 updatedParameters, String languageId, StringResultObject& result) at SolidCP.Providers.Web.IIs60.InstallGalleryApplication(Int32 UserId, String webAppId, List`1 updatedValues, String languageId)