Why is this nullref error displayed as such and what does it means?

Question

I'm sorry if this has already been answered, but for the love of me I can't find any way to formulate the problem.

I'm going through a Unity crash log, in which I found the only nullref there is, obviously the source of the issue.

However the log isn't giving me an explicit line in my code, only some lacunar information about the context in which the exception has been caught.

NullReferenceException: Object reference not set to an instance of an object
  at Virtuallyz.SNCF_RAT.Formation.PdfSaver.GenerateRatTable ([ ... params ... ]) [0x00000] in 
<e05b58e6c1f74067973c3e9105184851>:0 

I don't understand the format. Can someone explain what's displayed after the method signature ?

Thank you very much