Save issue for default WW attribute assignment

[KekkoLover]

After clicking on the option to set the WW attributes as default when creating Sims, I create two groups, one for attributes for males, and one for attributes for females, approximately 24 attributes per group. With this setting every Sim created by the game should already have random attributes. Except for the setting which remains active for only a few minutes, until a notification appears saying "Uh..uh", saving the WW is very complex so it is automatically deleted. How can I solve it?