From which version you have upgraded to 1908?
I have Upgraded form version 19.02
Hi Francisco, it look like something failed during upgrade leaving the DB in unstable state.
Can you check installation logs as well as cmdb_eng_debug_log.log from the DB folder?
I solved with BMC support adding the field "IsVirtual" on the BMC.CORE:BMC_BaseElement class. This field previously was on child classes, and from this version has been moved on the BMC.CORE:BMC_BaseElement.