This system error is likely occurring due to the upgrade to release 26.0. The issue will be analysed as a matter of urgency and resolved where possible.
A bug in release 26.0 related to the use of so-called “pipelined table functions” has been fixed, which was causing the itgenclr009 error message. A new release is available that should resolve this issue. The necessary changes are available from release 26.0.11 onwards and in all future BETA versions.
This new release has been/will be deployed to production on Invantive Cloud as soon as possible. Should deployment to production not succeed within 2 calendar days, consideration will be given to rolling back the upgrade from 25.0 to 26.0.