2020-02-01 21:59:41,930 [YDAWBH120][Thread:36][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.Web.HttpException (0x80004005): The state information is invalid for this page and might be corrupted. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 204.246.159.170
	Port: 57308
	Referer: http://www.google.com
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
	ViewState: MUN3f46hFKqbddWLLkm19znI24gqd4QmDN ASGkP9Jx2TooD3IT7XjYkSQ2k2x1heo6ckqeBok2Ic2eHG6cNto/uDlnW8YMDqLBW/uFEDpKAyzm/6BitRDuXXIjl2cXxEgDrw/A2dlMGO67zwWiOcyxA16dxRHTX4WU23n0N1 /hxRErIsjpi2qXWCJLW6hQNZN/pVK9VJ8sDCTlbbJfHwjw3cOzSNmfM8mlqEQ8qenvIckp13eesqztGzIh10eMuSs3QFPrj0rPt4DJBxF6O4yJ2AukE4IqQFcSjA== ---> System.FormatException: Invalid length for a Base-64 char array or string.
   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose)
   at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose)
   at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   --- End of inner exception stack trace ---
   at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
   at System.Web.UI.Page.LoadAllState()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2020-02-01 21:59:41,945 [YDAWBH120][Thread:36][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?tabid=37&error=An unexpected error has occurred&content=0
System.Web.HttpException (0x80004005): The state information is invalid for this page and might be corrupted. ---> System.Web.UI.ViewStateException: Invalid viewstate. 
	Client IP: 204.246.159.170
	Port: 57308
	Referer: http://www.google.com
	Path: /Default.aspx
	User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
	ViewState: MUN3f46hFKqbddWLLkm19znI24gqd4QmDN ASGkP9Jx2TooD3IT7XjYkSQ2k2x1heo6ckqeBok2Ic2eHG6cNto/uDlnW8YMDqLBW/uFEDpKAyzm/6BitRDuXXIjl2cXxEgDrw/A2dlMGO67zwWiOcyxA16dxRHTX4WU23n0N1 /hxRErIsjpi2qXWCJLW6hQNZN/pVK9VJ8sDCTlbbJfHwjw3cOzSNmfM8mlqEQ8qenvIckp13eesqztGzIh10eMuSs3QFPrj0rPt4DJBxF6O4yJ2AukE4IqQFcSjA== ---> System.FormatException: Invalid length for a Base-64 char array or string.
   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose)
   at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter2.Deserialize(String serializedState, Purpose purpose)
   at System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   --- End of inner exception stack trace ---
   at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError)
   at System.Web.UI.HiddenFieldPageStatePersister.Load()
   at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
   at System.Web.UI.Page.LoadAllState()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)