Hmmmm I seem to be having a similar issue today.
[2/26/2021 10:35:40 AM] [ERROR] Script execution error: [string "scripts/manager_actor5E_vision.lua"]:7: attempt to index global 'ActorManager5E' (a nil value)
[2/26/2021 10:35:40 AM] [ERROR] Script execution error: [string "scripts/manager_hp.lua"]:286: attempt to index global 'ActorManager5E' (a nil value)
That second one was from another extension that has the same issue I think, as I tried it on the 5e sample campaign with just this extension enabled and just got this one:
[2/26/2021 10:50:10 AM] [ERROR] Script execution error: [string "scripts/manager_actor5E_vision.lua"]:7: attempt to index global 'ActorManager5E' (a nil value)
Testing conditions for the sample campaign are:
FGU v4.0.10 Ultimate (2021-02-04)
Build Channel: Live
Server Type: Private LAN
Extensions: 5E - Vision v1.3, Theme: Wood
Rulesets Used:
D&D 5e ruleset v3.3.12
Core RPG ruleset v.3.3.12A