Sorry bud, everyone seem to have this problem and I don't think it's not going to be fixed because of no responses from the dev

so.. If you know how to unpack mods, this seems to be fixable by commenting out a line in WR.lua. If this does not ring a bell it may be hard to explain.

There is a tprint function which throws an error on line 268 (printing debug info about a weapon). Commenting this seems to fix it (I could upgrade a starter sword upto Iron).

-- debug function, prints table given
function tprint (tbl, indent)
--debbuging function

if not indent then indent = 0 end
for k, v in pairs(tbl) do
formatting = string.rep(" ", indent) .. k .. ": "
if type(v) == "table" then
sb.logInfo(formatting)
tprint(v, indent+1)
elseif type(v) == 'boolean' then
sb.logInfo(formatting .. tostring(v))
else
-- sb.logInfo(formatting .. v)/i]
end
end
end[/quote]

Check the quote for the line to comment (use -- to do that).

So, I've never specifically done what you mentioned before and I want to make sure I'm doing it correctly. I would go find the mod in the steam/game files, then I would open up the file, and I would paste that entire message after line 268? Is that how I could fix this bug?

It works fine for me

Easier fix than editing.. someone put up a quick fix suplement addon for Weapon Reinforcer
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1111363944

Still keep your original weapon reinforcer, and just sub to this as well. Just until our fair author makes it back from the coding blackhole. <3