Business logic error: Value was invalid. Parameter name: sddlForm (4281021)

Cannot login to the application. Some Domain Controllers were demoted from the network, after that the KACE Desktop Authority Manager Console opens normally, the right user credentials are in place. But, the error below appears after click the Login button.

Business logic error: Value was invalid. Parameter name: sddlForm

Call Stack

• at ScriptLogic.DAConsole.Common.GenericChannel.GenericChannel.SendOperation(String methodName, Object[] parameters)
• at BusinessLogicGenericChannel.AuthenticationUser(String , String , String , String , String , String , String )
• at ScriptLogic.DAConsole.DAConsole.DAComponentUI.Login.GetUserData()
• at ScriptLogic.DAConsole.DAConsole.DAComponentUI.Login.btnLogin_Click(Object sender, EventArgs e)
• at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
• at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
• at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
• at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
• at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
• at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

The demoted Domain Controllers were not removed from the KACE Desktop Authority Manager Console in the right way and for some unknown reason, the MainServer option on the SLMgr.ini (Configuration section of the file) was changed from his default value and it's pointing to a not existing server.

Example of the wrong value:

[Configuration]

MainServer=NotExistingDCServer

1. Navigate to the following path on the KACE Desktop Authority server: \\DA_Server_Name\slogic$, look for the file called "SLMgr.ini".
2. Right-click over the file and Edit it using a Notepad.
3. Under the Configuration section look for the MasterServer option, delete the existing value and enter the default value which is <auto-locate>,  the line must look like the one below: