SAP Note 19843 - No block found for roll area

Symptom:

No block found for roll area .
Roll-in of UID/Mode xxx/xxx failed, RC=-05.

Cause and prerequisites

User/mode no longer exists.

Solution
These SysLog messages do not represent a problem themselves, but could indicate previous problems.
Explanation:
When an SAP process terminates, a new process is started in its place. The new process first attempts to reset the runtime data of the predecessor transaction. To do this, the data is restored via the active user/roll area (roll-in). Depending on where the predecessor process was terminated, however, this data may not be complete. This fact is documented by the above error messages.
In any case, you should investigate the reason why the process terminated in the first place. References to this will usually appear in the system log, just before the other messages.