The Scrap_Merchant part checks if visualizer is enabled, but the API changed in 6.0.2.

Need to change Scrap_Merchant.lua, line 81 from

if select(5, GetAddOnInfo('Scrap_Visualizer')) then

to

local loadable, reason = select(4, GetAddOnInfo('Scrap_Visualizer'))
if loadable or reason == nil or reason == "DEMAND_LOADED" then

(p.s.: Not sure about loadable, it's SUPPOSED to be true when loaded or loadable according to wiki, but seems to be always false for Scrap_Visualizer)

Nice catch, did not notice that change