Webserver error

MESSAGE: Padding is invalid and cannot be removed.
SOURCE: mscorlib
FORM: 
QUERYSTRING: d=iWGPApfp97sBJpwRJCSea5oYLeWMMSSWUvu8KxXqEXacoed65f2glG5ZFM4cYSRnSTQtIvR_axoXfpEhsBNR4RXG0mN95gGR8PPib7mZb4o1&t=633450714656718750
TARGETSITE: Int32 DecryptData(Byte[], Int32, Int32, Byte[] ByRef, Int32, System.Security.Cryptography.PaddingMode, Boolean)
STACKTRACE:    at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)
   at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount)
   at System.Security.Cryptography.CryptoStream.FlushFinalBlock()
   at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo)
   at System.Web.UI.Page.DecryptString(String s)
   at System.Web.Handlers.ScriptResourceHandler.DecryptParameter(NameValueCollection queryString)