Substance to blender plugin error when loading material

Hi,

What version of Blender are you using? Also, is there any information on the Blender console/terminal that you could share with us? 

To view the console, go to the Windows menu -> Click on Toggle system console
For Mac: https://blender.stackexchange.com/questions/2078/how-to-use-blender-command-lines-in-osx 

Thank you so much. Saved me from near madness with this!

Blender changed an internal Python API - here's what I edited to get the plugin v1.0.1 working with Blender 3.4.

In the addon file 3.4/scripts/addons/Substance3DInBlender/material.py use a plain text editor to comment out these lines (prefix with '#') a couple lines after "Initialize shader sockets" to disable the crashing code, as shown:

                    # if _socket["source"] == "input" and _socket["name"] not in _items[_socket["id"]].inputs:
                    #     _items[_socket["id"]].inputs.new(_socket["type"], _socket["name"])
                    # elif _socket["source"] == "output" and _socket["name"] not in _items[_socket["id"]].outputs:
                    #     _items[_socket["id"]].outputs.new(_socket["type"], _socket["name"])

After those lines, put this alternate code that uses the preferred method from the developer site:

                    grptree = _sbs_group.node_tree
                    if _socket["source"] == "input" and _socket["name"] not in grptree.inputs:
                        grptree.inputs.new(_socket["type"], _socket["name"])
                    elif _socket["source"] == "output" and _socket["name"] not in grptree.outputs:
                        grptree.outputs.new(_socket["type"], _socket["name"])

Note that python is very sensitive to indentation! The new code should be very similar in indentation to the original version of the old code.

Your mileage may vary and this may not be a fully correct solution, but this seems to have fixed the plugin crash for me that started with Blender 3.4. Hope it helps!