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Web Sites service when update show error after allow Web Publishing Settings . and also create account fail from whmcs

whmcs Error message :

Module Command Error
CreateAccount Fault: (Code: -500, Message: Fault: An unknown error occured (Code: -500). Please reference SolidCP BusinessErrorCodes for further information, Service ID: 195)

I try remove the solidcp and reinstall it but same result

Hope any one have solution for that .

thank you

Stack Trace:
System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Could not delete system user ---> System.Runtime.InteropServices.COMException: The user name could not be found. 

at System.DirectoryServices.DirectoryEntries.Find(String name, String schemaClassName) 
at SolidCP.Providers.Utils.SecurityUtils.DeleteUser(String username, RemoteServerSettings serverSettings, String usersOU) 
--- End of inner exception stack trace --- 
at SolidCP.Providers.Utils.SecurityUtils.DeleteUser(String username, RemoteServerSettings serverSettings, String usersOU) 
at SolidCP.Providers.Web.IIs70.SetupWebDeployPublishingOnServer(List`1 messages) 
at SolidCP.Providers.Web.IIs70.Install() 
at SolidCP.Providers.Web.IIs80.Install() 
at SolidCP.Server.ServiceProvider.Install() 
--- End of inner exception stack trace ---