I have a working op & graph. If I add a

yield AssetMaterialization

statement, the op now fails (while the materialization does work). Any ideas?

hi @Remi Gabillet, this error message should definitely be improved. The actual issue is that if you yield an event during op execution (such as an AssetMaterialization), you also need to yield your output explicitly instead of returning it

yield Output(segment_unified_table)

got it. So any time I

yield AssetMaterialization

in an op, I also need to

yield Output

exactly yep