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Application Error on Startup

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    I downloaded DNN 9.10.1 and installed it with a SQL database, and yesterday it was working great! However, this morning when I logged on I only saw "Application Error." Clicking "Return to Site" doesn't do anything. I went into the logs and found this was the error. 

    DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
       at DotNetNuke.UI.Skins.Skin.GetSkin(PageBase page)
       at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
       at System.Web.UI.Control.<InitRecursiveAsync>d__225.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Web.Util.WithinCancellableCallbackTaskAwaitable.WithinCancellableCallbackTaskAwaiter.GetResult()
       at System.Web.UI.Page.<ProcessRequestMainAsync>d__523.MoveNext()
       --- End of inner exception stack trace ---

    I have no idea what caused this, and again, this worked yesterday and I have not changed anything since it last worked. Does anyone have any ideas? Thanks!

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