-25349: Error exporting <type> data of table <table_name>. See Loader server log file for more information 

Explanation:

You executed a command to export data in the format PAGES. The command was terminated because data of specified type (possible types of primary data, LONG data) could not be exported. See the log file for additional messages describing the cause of the error.

User Response:

Fix the cause of the error and re-execute the command.