2020-07-28 03:34:59,928 [YDAWBH120][Thread:64][ERROR] DotNetNuke.UI.WebControls.DNNListEditControl - System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.String.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value)
   at DotNetNuke.UI.WebControls.DNNListEditControl.get_OldIntegerValue()
2020-07-28 03:36:35,444 [YDAWBH120][Thread:64][ERROR] DotNetNuke.UI.WebControls.DNNListEditControl - System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.String.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value)
   at DotNetNuke.UI.WebControls.DNNListEditControl.get_OldIntegerValue()
2020-07-28 05:03:49,710 [YDAWBH120][Thread:43][ERROR] DotNetNuke.UI.WebControls.DNNListEditControl - System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.String.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value)
   at DotNetNuke.UI.WebControls.DNNListEditControl.get_OldIntegerValue()
2020-07-28 05:33:48,210 [YDAWBH120][Thread:5][ERROR] DotNetNuke.UI.WebControls.DNNListEditControl - System.FormatException: Input string was not in a correct format.
   at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
   at System.String.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value)
   at DotNetNuke.UI.WebControls.DNNListEditControl.get_OldIntegerValue()
2020-07-28 09:42:12,960 [YDAWBH120][Thread:46][ERROR] DotNetNuke.Common.Utilities.FileSystemUtils - System.IO.IOException: The process cannot access the file 'D:\HostingSpaces\PHerau\ha.health-science.be\wwwroot\Portals\4-System\Cache\Pages\2734_52A231EF959EE26EA6D661A74B4E4109267F50652ED0C8497853A2978D9DD22B.data.resources' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.InternalDelete(String path, Boolean checkHost)
   at System.IO.File.Delete(String path)
   at DotNetNuke.Common.Utilities.FileSystemUtils.DeleteFileWithWait(String filename, Int16 waitInMilliseconds, Int16 maxAttempts)
2020-07-28 11:41:26,428 [YDAWBH120][Thread:75][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
   at DotNetNuke.Framework.DefaultPage.InitializePage()
   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2020-07-28 11:41:26,507 [YDAWBH120][Thread:75][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?error=An unexpected error has occurred&content=0
System.NullReferenceException: Object reference not set to an instance of an object.
   at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
   at DotNetNuke.Framework.DefaultPage.InitializePage()
   at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)