I am getting an error with stl export operator. Any ideas why? The mesh region is found fine with the mesh_provider op, but the stl export fails with: Could not find the specified Output Type
import mech_dpf
import Ans.DataProcessing as dpf
my_file_path=r'C:\Users\mthompso\MyData\test.stl'
dataSource = dpf.DataSources(Model.Analyses[0].ResultFileName)
op = dpf.operators.mesh.mesh_provider() # operator instantiation
op.inputs.data_sources.Connect(dataSource)
my_mesh = op.outputs.mesh.GetData()
op = dpf.operators.mesh.stl_export() # operator instantiation
op.inputs.mesh.Connect(my_mesh)
op.inputs.file_path.Connect(my_file_path)
stl = op.outputs.data_sources.GetData()