The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.

at System.Convert.FromBase64_ComputeResultLength(Char* inputPtr, Int32 inputLength) at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength) at System.Convert.FromBase64String(String s) at Epicor.Web.Helpers.Extensions.CommonExtensions.Decrypt(String cipherText) in D:\a\1\s\Epicor.Web\Helpers\Extensions\CommonExtensions.cs:line 119 at Epicor.Web.Business.CustomAuthorizeContentAttribute.SetSecure(String query) in D:\a\1\s\Epicor.Web\Business\CustomAuthorizeContentAttribute.cs:line 73 at Epicor.Web.Business.CustomAuthorizeContentAttribute.OnAuthorization(AuthorizationContext filterContext) in D:\a\1\s\Epicor.Web\Business\CustomAuthorizeContentAttribute.cs:line 33 at System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_1.<BeginInvokeAction>b__0(AsyncCallback asyncCallback, Object asyncState)