A new version of Scrap was released on 12/25/19 that changed the API exposed by the addon. The Scrap object itself is no longer a Button and is instead just a table. This means Scrap.HookScript no longer exists. The button itself is now accessed via Scrap.Merchant, but it is lazy loaded so AdiBags will need to wait for it to be created.

Quick and dirty change i made to to Junk.lua, starting on line 246:

local old = Scrap.NewModule

Scrap.NewModule = function( self, id, ... )
  local result = old( self, id, ... )

  if id == 'Merchant' then
    result:HookScript('OnReceiveDrag', function()
  		if prefs.sources.Scrap then
  			wipe(cache)
  			addon:SendMessage("AdiBags_FiltersChanged")
  		end
  	end)
  end
  
  return result
end

I'm seeing this error in the classic release as well. Scrap update seems to have happened across both game versions.

Date: 2019-12-29 08:09:29
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\AdiBags\modules\Junk.lua line 244:
   attempt to call method 'HookScript' (a nil value)
Debug:
   AdiBags\modules\Junk.lua:244: in main chunk

A new version of Scrap was released on 12/25/19 that changed the API exposed by the addon. The Scrap object itself is no longer a Button and is instead just a table. This means Scrap.HookScript no longer exists. The button itself is now accessed via Scrap.Merchant, but it is lazy loaded so AdiBags will need to wait for it to be created.

Quick and dirty change i made to to Junk.lua, starting on line 246:

local old = Scrap.NewModule

Scrap.NewModule = function( self, id, ... )
  local result = old( self, id, ... )

  if id == 'Merchant' then
    result:HookScript('OnReceiveDrag', function()
  		if prefs.sources.Scrap then
  			wipe(cache)
  			addon:SendMessage("AdiBags_FiltersChanged")
  		end
  	end)
  end
  
  return result
end

sorry I'm being dumb but my junk.lua file looks very different to yours at line 246

are you suggesting we add your code block at line 246 - within the if function that begins on line 239 "if Scrap and type(Scrap.IsJunk) == "function" then"

thanks

A new version of Scrap was released on 12/25/19 that changed the API exposed by the addon. The Scrap object itself is no longer a Button and is instead just a table. This means Scrap.HookScript no longer exists. The button itself is now accessed via Scrap.Merchant, but it is lazy loaded so AdiBags will need to wait for it to be created.
Quick and dirty change i made to to Junk.lua, starting on line 246:

local old = Scrap.NewModule

Scrap.NewModule = function( self, id, ... )
  local result = old( self, id, ... )

  if id == 'Merchant' then
    result:HookScript('OnReceiveDrag', function()
  		if prefs.sources.Scrap then
  			wipe(cache)
  			addon:SendMessage("AdiBags_FiltersChanged")
  		end
  	end)
  end
  
  return result
end

sorry I'm being dumb but my junk.lua file looks very different to yours at line 246

are you suggesting we add your code block at line 246 - within the if function that begins on line 239 "if Scrap and type(Scrap.IsJunk) == "function" then"

thanks

Nope - you must replace the function. A better (complete) way to do this is currently pending a PR merge #422

This is what I did (keeping the old code around):

        -- Scrap:HookScript('OnReceiveDrag', function()
        --      if prefs.sources.Scrap then
        --              wipe(cache)
        --              addon:SendMessage("AdiBags_FiltersChanged")
        --      end
        -- end)

        -- BEGIN SCRAP FIX -- 
        local function updateScrap()
                if prefs.sources.Scrap then
                        wipe(cache)
                        addon:SendMessage("AdiBags_FiltersChanged")
                end
        end

        if Scrap.HookScript then
                Scrap:HookScript('OnReceiveDrag', updateScrap)
        end

        if Scrap.Merchant and Scrap.Merchant.HookScript then
                Scrap.Merchant:HookScript('OnReceiveDrag', updateScrap)
        end

        if Scrap.ToggleJunk then
                _G.hooksecurefunc(Scrap, "ToggleJunk", updateScrap)
        end
        -- END SCRAP FIX --