need help Invalid length for a Base-64 char array

I am using Windows 2000 Nt and have IE 6.0

How do I fix this problem

Thanks rrwestva


FormatException: Invalid length for a Base-64 char array.]
System.Convert.FromBase64String(String s) +0
System.Web.UI.LosFormatter.Deserialize(String input) +25
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +101

[HttpException (0x80004005): Invalid_Viewstate
Client IP: 69.168.57.28
Port: 1432
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
ViewState: dDwtMTg2NDI4MDg2O3Q8O2w8aTwwPjs+O2w8dDw7bDxpPDE+O2 k8MTk+O2k8Mzk+O2k8NDU+O2k8NDc+O2k8NTE+O2k8NTU+O2k8 NTc+O2k8NTk+Oz47bDx0PDtsPGk8MTE+O2k8MTQ+O2k8MTU+O2 k8MTc+Oz47bDx0PHA8cDxsPFRleHQ7PjtsPFdlbGNvbWUgUmVi ZWNjYTs+Pjs+Ozs+O3Q8cDxwPGw8VGV4dDs+O2w8RGF0YWJhc2 UgdGhhdCB5b3UgYXJlIGFjY2Vzc2luZyBpczs+Pjs+Ozs+O3Q8 cDxwPGw8VGV4dDs+O2w8SnVseSAwNCwgMjAwNiA0OjA2IFBNOz 4+Oz47Oz47dDxwPHA8bDxUZXh0Oz47bDxSYW50aXMgMjE2IDs+ Pjs+Ozs+Oz4+O3Q8cDw7cDxsPE9uQ2xpY2s7PjtsPHdpbmRvdy 5vcGVuKCdjb21tb24vc2NyaXB0cy9jYWwyLmFzcHg/dGV4dGJveD1TZWxGcm9tRGF0ZScsJ2hpJywnd2lkdGg9MzAwLG hlaWdodD0yNjAsbGVmdD03MTAsdG9wPTQ0MCxtZW51YmFyPW5v LHNjcm9sbGJhcnM9bm8scmVzaXphYmxlPW5vJyk7Pj4+Ozs+
Http-Referer: http://www.mdnetsolutions.org/web/Reports.aspx
Path: /web/Reports.aspx.]
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +447
System.Web.UI.Page.LoadPageViewState() +18
System.Web.UI.Page.ProcessRequestMain() +447

rrwestva