Nutscript plugins attempt to call field "Register"

[LordAtropa]

I'm trying to get plugins for my NS HL2RP server to work, but this error always causes these two plugins to crash:

[ERROR] gamemodes/hl2rp/plugins/hl2_combinelight/sh_plugin.lua:5: attempt to call field 'Register' (a nil value)
  1. unknown - gamemodes/hl2rp/plugins/hl2_combinelight/sh_plugin.lua:5
   2. include - [C]:-1
    3. include - gamemodes/nutscript/gamemode/core/sh_util.lua:17
     4. load - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:44
      5. loadFromDir - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:189
       6. initialize - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:180
        7. unknown - gamemodes/nutscript/gamemode/shared.lua:65

[ERROR] gamemodes/hl2rp/plugins/hl2_stuffs/sh_plugin.lua:45: attempt to call field 'Register' (a nil value)
  1. unknown - gamemodes/hl2rp/plugins/hl2_stuffs/sh_plugin.lua:45
   2. include - [C]:-1
    3. include - gamemodes/nutscript/gamemode/core/sh_util.lua:17
     4. load - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:44
      5. loadFromDir - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:189
       6. initialize - gamemodes/nutscript/gamemode/core/libs/sh_plugin.lua:180
        7. unknown - gamemodes/nutscript/gamemode/shared.lua:65

Any help would be greatly appreciated, thanks!