The msrpc.lua and msrpctypes.lua were giving off errors when running the command: nmap -Pn -p445 --script smb-brute domain.com -d.
The errors in the msrpctypes.lua script came from the migration from bin.pack and bin.unpack to string.pack and string.unpack. The former accepted nil values for as arguments and we did not do any arithmetic to determine whether the data is enough to extract an object. Now, however, we need to manually check whether the data is enough and can no longer pass nil values as arguments. The fix just initializes uninitialized variables to 1 which is the default for Lua.
The errros in the msrpc.lua script came from the wrong library referencing for the strjoin method used in some internal methods. I managed to find it in the stringaux library, not in the stdnse.
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