ERROR: Import from file %1 failed. Error file is saved in %2. If the error is "Insufficient Rights" (Ldap error code 50), ...

ERROR: Import from file %1 failed. Error file is saved in %2. 

If the error is "Insufficient Rights" (Ldap error code 50), please make sure the specified user has rights to read/write objects in the schema and configuration containers, or log off and log in as an user with these rights and rerun forestprep. In most cases, being a member of both Schema Admins and Enterprise Admins is sufficient to run forestprep.