SAP Message REB_GENERATOR031 - Reading structure &1 has failed

Diagnosis
Reading structure &v1& has failed. This can occur if the DDIC does notcontain an active version of the structure.

System Response
The selected action cannot be performed.

Procedure
Inform your system administrator.

Procedure for System Administration
This is probably a follow-on error from a different problem. Does thelog contain any further messages before the current message?
If so, first correct the cause of these messages and then restart thegeneration.
Otherwise, contact your support organization.