It’s been a while since I used NServiceBus and I got this annoyingly cryptic error message this morning:
Value cannot be null.
Parameter name: meth
I finally found this post about it and it’s actually a fairly obvious mistake - I had added property without a setter on one of the objects that needed to be serialized as part of my message. The error message was unfortunately cryptic enough for me to take a while to find it. I thought I’d post this on here for my own future reference.