-24951: ERR_USRREAD - could not read user data 

Explanation:

The system could not read the DBMServer data of the user(s).

User action:

Check the file system attributes and the operating system user rights in the User Profile Container. The name of this file is <dbname>.upc. Under NT, this file is located in the CONFIG directory of the database installation. In UNIX systems, this file is located in /usr/spool/sql/config. Use the DBMServer statement user_getall to determine whether the user exists.