Error processing request
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_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at Aptify.Framework.Web.Common.WebCryptography.DecryptTripleDES(String value, Byte[] key, Byte[] iv)
   at Aptify.Framework.Web.Common.AttachmentHandler.ProcessRequest(HttpContext context)