it says this
All vertices must be part of a vertex group, be non-trivially weighted (> 0.4), and the vertex group must correspond to a bone in the armature.
Groups of the bad vert that don't correspond to a bone: []. If a vert is supposed to belong to this group then either a bone is missing or you have the wrong group.
Groups of the bad vert below weight limit: []. If a vert is supposed to belong to one of these groups then make sure to increase its weight.
but it doesnt say which groups are bad anymore
All vertices must be part of a vertex group, be non-trivially weighted (> 0.4), and the vertex group must correspond to a bone in the armature.
Groups of the bad vert that don't correspond to a bone: []. If a vert is supposed to belong to this group then either a bone is missing or you have the wrong group.
Groups of the bad vert below weight limit: []. If a vert is supposed to belong to one of these groups then make sure to increase its weight.
but it doesnt say which groups are bad anymore