Me and my friends are getting 2 Lua errors at the end of each game about voting for the next gamemode. Any ideas on how to fix it?

gamemode/fretta/gamemode/vgui/vgui_gamenotice.lua:37: attempt to index local 'txt' (a nil value)
1. AddEntityText - gamemodes/fretta/gamemode/vgui/vgui_gamenotice.lua:37
2. AddText - gamemodes/fretta/gamemode/vgui/vgui_gamenotice.lua:54
3. AddDeathNotice - gamemodes/fretta/gamecode/cl_deathnotice.lua:96
4. func - gamemodes/base/gamemode/cl_deathnotice.lua:67
5. unknown - lua/includes/extensions/net.lua:32

gamemodes/fretta/gamemode/sv_gmchanger.lua:25: attempt to index a nil value
1. WorkOut WinningGamemode - gamemodes/fretta/gamemode/sv_gmchanger.lua:25
2. FinishGamemodeVote - gamemodes/fretta/gamemode/sv_gmchanger.lua:320
3. unknown - gamemodes/fretta/gamemode/sv_gmchanger.lua:251