Read the first of the DynDOLOD 3 Alpha thread which log and debug log to upload when making posts. Upload the entire crash log. The crash is of since that ACTI base record does not have a model, while BSExtraDataList seems to be a block in a NIF. Double check the crash does not happen when DynDOLOD output is not active. See https://dyndolod.info/FAQ which explains to check ..\DynDOLOD\docs\DynDOLOD-README.txt. Enable the debug option in DynDOLOD_Worlds.json or DynDOLOD_Worlds