Photon - Value cannot be null

[LauraKanePhD]

Hi Jan,

I'm trying to use the photon modification with the interactions tutorial data. I have setup my python path and it appears in the executable box as green. I keep getting an error message however, and I'm unsure where the issue is (see below).

Any help you can give me would be greatly appreciated!

[K-Boum]

Hello,

I, too, am experiencing the same problem while working with the tutorial data.