perdue cube

[??????????]

hi:
   I use the API to create cube,the respon roughly about Cuboid overstep the 
boundary??after that ??the model  has two cube of Noseen??so??show error info 
dialog when i tray to drop the model ,the error info is 'Failed to delete 
model. Caused by: Model is referenced by Cube 'CubeName' , could not dropped'.
   but this cube isn't in the webUI of cube list,through API also can't to 
getting it's info.
   how to drop the two cube,or drop the model.