Wireshark 2.6 throws error when loading LUA dissector

edit

The error message should also tell you what it is (at least, the code shows that the Lua state is printed). Are the scripts in the correct location (not sure if that changed between 2.4 and 2.6), and are there no duplicates?

The complete Error message:

Lua: Error during loading:

[string "C:\Program Files\Wireshark\plugins\..."]:161: bad argument #2 to 'Proto' (Proto_new: there cannot be two protocols with the same description)

I also did a try to remove all Scripts but one, the only difference is the number of errors I get (usually 1 one per file). As the dissector seems to work (apart of this loading issue), I assume that the location is still valid.

And can you show the code (including context) around line 161 referred to in the error message?

-- define dissector and fields

medial_pct = Proto("MEDIAL_PCT","Medial PCT UDP")

local f_type = ProtoField.new("PDU Type","medial_pct.pdu",ftypes.UINT16)
local f_unit  = ProtoField.new("MAC","medial_pct.mac",ftypes.STRING)

Maybe try:

medial_pct = Proto.new("MEDIAL_PCT","Medial PCT UDP")

As in the API specification for the Proto class here.