Server Error in '/' Application.

Exception occurred while verifying CheckSum. Padding is invalid and cannot be removed.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: paytm.exception.CryptoException: Exception occurred while verifying CheckSum. Padding is invalid and cannot be removed.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[CryptoException: Exception occurred while verifying CheckSum. Padding is invalid and cannot be removed.]
   paytm.CheckSum.verifyCheckSum(String masterKey, Dictionary`2 parameters, String checkSum) +366
   LIFEFORCE.Callback.Page_Load(Object sender, EventArgs e) in C:\Projects\LIFEFORCE\LIFEFORCE WEBSITE\LIFEFORCE\Callback.aspx.cs:66
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0