This error is related with a bug in the cabview files: TRAINS\TRAINSET\Fs-ETR500FR-45\Cabview\ etr500-30-TA_alias.cvf etr500-30-TA_alias_rv.cvf Once both files were fixed, the FDT-FR9734_VR-MI activity started without error.
It's not an Open Rails bug.
This error is related with a bug in the cabview files: TRAINSET\ Fs-ETR500FR- 45\Cabview\ 30-TA_alias. cvf 30-TA_alias_ rv.cvf
TRAINS\
etr500-
etr500-
Once both files were fixed, the FDT-FR9734_VR-MI activity started without error.
It's not an Open Rails bug.