Select the vertex where the two parts of the mesh joints.
Click on Vertex - Weld Together
Step 7
The flat line is gone.
Step 8
Now is time to make the assignemets.
Select the right calf and assign it to r_calf.
Milkshape uses to show the right part of the mesh on the left and upside down, so make sure that you're assignning the joints correctly!!
Step 9
Then select the rigth foot and assign it to r_foot.
Do the same with the other leg changing r by l ;-).
Step 10
On the Groups tag, click on Comment. A Pop up windoww will appear. C copy the text of the window (in this case BodyName: body)