-24951: ERR_USRREAD - could not read user data 

Explanation:

The database manager operator (DBM operator) data could not be read.

User Response:

Check the file system attributes and the operating system rights of the user profile container. This file has the name <database_name>.upc. On Windows, you can find this file in the configdirectory of the database installation. On UNIX systems, this file is stored in <independent_data>/config. Use the DBM command user_getall  to check the existence of the user.