We are getting random  "Object Reference not set to an instance of an object" errors when attempting to login to the umbraco admin. This seems to be fixed when the web.config file is updated (clearing cache I suppose). We are unsure what could be causing this? The only thing I think of is we have a number of python macros installed but I am not sure why this would effect anything since they are called on the front end? Does anyone ever see this error themselves, and have they come up with a solution? (Some of it might be garbled because I ocr'd a screenshot and tried to clean it up - but error is below)

System.NuIlRefetenceException Object Reference not set to an instance of an object

[NullReferenceException: Object reference not set to an instance of an object.]

umbraco.BusinessLopic.Utils.TypeFinder.FindClassesOfType(Boolean useSeperateAppDomain) +56 umbraco.BusinessLogic.Actions.Action.RegisterActions() +103

umbraco.BusinessLogic.Actions.Action..cctor() +185

[TypeInitializationException: The type initializer for 'umbraco.gusinessLogic.Actions.Action' threw an exception.] umbraco.cms.presentation_umbraco.RenderActionJS() +80

umbraco.cms.presentation._umbraco.Page_Load(Object sender, EventArgs e) +1326

System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp. Object o, Object t, EventArgs e) +25 System.web.Util.CalliiEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +42

System.Web.UI.Control.OnLoad(EventArgs e) +132 umbraco.BasePages.BasePage.OnLoad(EventArgs e) +21

System.Web.UI.Control.LoadRecursive() +66

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428

Version Information: Microsoft .NET Framework Version2.0.50727.3603, ASP.NET Versiort2.0.93727.4049