load model built by solidworks

Hi,
I use the solidworks to build a ‘Cube’, and then output the ‘Cube’ in ‘stl’ style. I want to use the sofa to load the model, but it fails.
My code is:

import os
from stlib.scene import Scene
dirPath = os.path.dirname(os.path.abspath(__file__))+’/’

def createScene(rootNode):
# Setting the gravity, assuming the length unit is in millimeters
scene = Scene(rootNode, gravity=[0.0, -9810, 0.0], plugins=[“SofaSparseSolver”])

# Setting the timestep in seconds
rootNode.dt = 0.001

# Tool to load the mesh file of the silicone piece. It will be used for both the mechanical and the visual models.
rootNode.createObject(“MeshSTLLoader”, name=”loader2″, filename=”mesh/cube.STL”)

# Basic mechanical modelling of the silicone piece
elasticbody = rootNode.createChild(“MechanicalBody”)
elasticbody.createObject(“MechanicalObject”, name=”dofs”,
position=rootNode.loader2.position,
showObject=True, showObjectScale=5.0,
rotation=[90.0, 0.0, 0.0])
elasticbody.createObject(“UniformMass”)

elasticbody.createObject(“EulerImplicitSolver”)
elasticbody.createObject(“SparseLDLSolver”)

# Visual object
visual = rootNode.createChild(“Visual”)
# The mesh used for the Visual object is the same as the one for the MechanicalObject, and has been introduced in the rootNode
visual.createObject(“OglModel”, name=”renderer”,
src=’@../loader2′,
color=[1.0, 1.0, 1.0, 2])

# A mapping applies the deformations computed on the mechanical model (the input parameter)
# to the visual model (the output parameter).
elasticbody.createObject(“IdentityMapping”,
input=elasticbody.dofs.getLinkPath(),
output=visual.renderer.getLinkPath())

And I got the information in terminal as following:

[INFO] [SceneCheckerVisitor] Validating node “root” with checks: [SceneCheckDuplicatedName, SceneCheckMissingRequiredPlugin, SceneCheckUsingAlias]
[INFO] [SceneCheckerVisitor] Finished validating node “root”.
[WARNING] [UniformMass(UniformMass)] indices vector size is <= 0
[WARNING] [RealGUI] Global Bounding Box seems very small; Your viewer settings (based on the bbox) are likely invalid, switching to default value of [-1,-1,-1,1,1,1].This is caused by using component which does not implement properly the updateBBox function.You can remove this warning by manually forcing a value in the parameter bbox="minX minY minZ maxX maxY maxZ" in your root node