Visualize Neurons from NeuPrint in Blender

[Specom]

Hey,

I would like to import a CellBlender Model (preferably JSON format), however, I always receive to following error (see attachment). Is there anything I am doing wrong? Actually I would like to import the geometry of a neuron downloaded from https://neuprint.janelia.org/ I tried downloading them as *JSON and *txt file (the latter presumably being SWC format). I am not able to import them into Blender or other software. Also, I found on the Internet the SWC Mesher addon, which does not show up in any Blender version in "preferences/addon".. Any suggestions how to visualize these files in Blender? or convert them into OBJ or STL files?

Hope somebody has any advise.

Thanks

Sander