aa....aa

aa....aa: Stack trace of the exception

Description

The stack trace of the exception that has occurred during the de-serialization of the session object will be output row-wise.

Action

Check the message output as the class responsible for the occurrence of the exception, and confirm the following details:

• Has the class of the session attribute, or the class referenced from there been deleted?
• Has the class of the session attribute, or the class referenced from there been changed to a configuration not compatible with the data format during serialization?