Error while loading technology prototype "qa_mining-depot-ams" (technology): Key "icon" not found in property tree at ROOT.technology.qa_mining-depot-ams
Modifications: Quality Assurance
HELP Please

Can you tell which other mode provides mining depots? Supposedly this is another possibility of a problem with an icon - no icon in the prerequisite tech at the moment of creating AMS machines... If it's like that, then possible hotfix to add a check if icon exists. But still better to run with the mod that causes problem. Also, beside 1.2.6 introduced a new recipe for ams techs, if prerequisite tech exists... Idk if this change was added intentionally or was it WIP

https://mods.factorio.com/mod/Mining_Drones_Remastered I had this mod installed.
I have one more question, can you tell me how to make it so that the material is only legendary?

This should work, this time it checks if the icon exists, and if it doesn't - it moves on to the icons property. If it exists (which it should for all valid technologies which don't have icon property) it copies that to the new AMS technology. It also deletes the irrelevant property.

                    if data.raw["technology"][Prerequisite].icon ~= nil and data.raw["technology"][Prerequisite].icon ~= "" then
                        AMSMachineTechnology.icon = data.raw["technology"][Prerequisite].icon
                        AMSMachineTechnology.icon_size = data.raw["technology"][Prerequisite].icon_size
                        AMSMachineTechnology.icons = nil
                    elseif data.raw["technology"][Prerequisite].icons ~= nil and data.raw["technology"][Prerequisite].icons ~= {} then
                        AMSMachineTechnology.icons = data.raw["technology"][Prerequisite].icons
                        AMSMachineTechnology.icon = nil
                        AMSMachineTechnology.icon_size = nil
                    end

I have one more question, can you tell me how to make it so that the material is only legendary?

I don't know what you mean, can you please elaborate?

I don't speak English very well, I meant about the quality of the material mined. Like iron and copper, I want it to be not of normal quality but of legendary, that is, the last, but I don't know how to make it...

I don't speak English very well, I meant about the quality of the material mined. Like iron and copper, I want it to be not of normal quality but of legendary, that is, the last, but I don't know how to make it...

You will need to use quality modules, or the base quality setting. The Quality Module Multiplier and Allow quality modules in beacons settings may help with that.