object builder problem

Hello, i have an issue with a custom otclient /data/spr , whenever i try to open it with object builder this appears :

ArgumentError: The minimum value may not be greater than the maximum value.
at nail.otlib.things::FrameDuration()
at nail.otlib.things::ThingSerializer$/readSprites()
at nail.otlib.things::ThingTypeStorage/loadThingTypeList()
at nail.otlib.things::ThingTypeStorage/readBytes()
at nail.otlib.things::ThingTypeStorage/load()
at...

object builder problem