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So lets locate the negative mass source values. The image that you have attached in the post above says that: Share that table and lets probe it. So far it looks like that you might have applied equipment loads to a slab and this error that you are getting is because of meshing. I am not sure if that is the case, this is my guess. Anyway, please share the table and we can pin point the problem area. Also, for general information, this is what ETABS does to convert load patterns into Mass Source. and also this: Thanks.