Hello.
An Error occured when I tried to unpack texture after importing .skel file.
Error logs are
ERROR: Unable to unpack atlas:
[awt.image.RasterFormat] negative or zero height
at java.awt.image.Raster.<init>(Unknown Source)
at java.awt.image.WritableRaster.<init>(Unknown Source)
at sun.awt.image.SunWritableRaster.<init>(Unknown Source)
at sun.awt.image.ByteComponentRaster.<init>(Unknown Source)
at sun.awt.image.ByteInterleavedRaster.<init>(Unknown Source)
at sun.awt.image.ByteInterleavedRaster.createWritableChild(Unknown Source)
at java.awt.image.BufferedImage.getSubimage(Unknown Source)
at s.ahC.(:210)
at s.ahC.(:189)
at s.ahC.(:122)
at s.VAH.(:142)
at s.Hnq.(:554)
at s.oez.(:576)
at s.OaI.(:65)
at s.VKm.(:98)
at s.hKB.(:47)
at s.bEj.(:125)
at s.hKB.(:50)
at s.cgp.(:226)
at s.cgp.L(:187)
at s.Hnq.Z(:997)
at s.CcJ.V(:487)
at s.Dwy.run(:267)
<events>
nevermind, the image size wasn't matched with .atlas's info.
image size in .atlas was 2048 x 2048, although the actual size was 1024 x 1024.
it was finely unpacked after I expand it. thank you.