NLog exception: Collection was modified; enumeration operation may not execute
See the question and my original answer on StackOverflowI think you may be using an old version of NLog. Can you check the NLog file src/NLog/Internal/ObjectGraphScanner.cs you rely on (or look into the assembly with a tool such as .NET reflector)?
It should be like what's displayed in green in this bug fix:
BUG 6015: InvalidOperationException (Collection was modified) in call…