Error: Could not convert to a vector 3D

Hello,

Here is what I am trying to do:

1. Import STL
2. Grab all of the normals of each TRIANGLE in the STL, not surface
3. Calculate the angle of those normals with respect to the XY Plane normal, ie (0,0,1)

Here is the code:

import rhinoscriptsyntax as rs

Mesh = rs.AllObjects()
Triangles = rs.ExplodeMeshes(Mesh)
Triangles = rs.AllObjects()

XYPlane = rs.CreateVector((0,0,1))
for normal in Triangles:
vector = rs.MeshFaceNormals(normal)
print(vector)
angle = rs.VectorAngle(XYPlane, vector)
print(angle)

However, I always get the same error when trying to use the Vector Angle function. Any idea? Here it is:

Message: Could not convert [<Rhino.Geometry.Vector3d object at 0x00000000000187F0 [-0.0249902363866568,0.996604800224304,0.0784497708082199]>, <Rhino.Geometry.Vector3d object at 0x00000000000187F1 [-0.0249902345240116,0.996604800224304,0.0784497782588005]>] to a Vector3d

Traceback:
line 715, in coerce3dvector, “C:\Users\toura\AppData\Roaming\McNeel\Rhinoceros\7.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\utility.py”
line 532, in VectorAngle, “C:\Users\toura\AppData\Roaming\McNeel\Rhinoceros\7.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\pointvector.py”
line 12, in , “C:\Users\toura\Documents\pythonfiles\RhinoMeshTriangles.py”

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