Can you fix the bug for researching the Ion cannon? The technology lua file says it needs "energy-weapons-damage-6". This does not show up anywhere in the technology list to research.
https://www.dropbox.com/s/u5y7z4srprjtniv/Screenshot%202021-01-03%2000.34.03.png?dl=1
https://www.dropbox.com/s/slxsqy11vgbriic/Screenshot%202021-01-03%2000.34.22.png?dl=1

Everything in the technology tree prior to the ion cannon is researched. The only way to research it is to specifically use the game.player.force.technologies command on the above mentioned energy weapons damage tech to unlock it.

Sorry, I can not reproduce this
"space exploration": https://prnt.sc/wf41jb
"vanilla": https://prnt.sc/wf42ta

I need to know which mod changes the tree and removes the energy-weapons-damage-6.

Could this be the culprit?
https://www.dropbox.com/s/fw0ys58t8grwwbv/Screenshot%202021-01-03%2005.57.02.png?dl=1

For sharing screenshots it's easier to use a service like Lightshot, then you can view the images directly instead of always having to download them.
Could you upload your save game? Than I can take a look.

Sure. No problem. Here you go: https://www.dropbox.com/s/gnylh1j6zhtxf4k/Kuxynator.zip?dl=1

Can not found a problem with 1.1. all looks OK
https://prnt.sc/wfthyx
this mods are not available
https://prnt.sc/wftm3h
maybe one of this causes the issue
could you try this on 1.0 without the mods? remove one by one and restart until the issue occurs. then u have found the mod.
It may also be that an update exists for one of the loaded mods in 1.1 but not for 1.0 and the problem is still fixed in 1.1

Well, per the screenshot I sent you, it shows that Rampant Arsenal is modifying the energy weapons 6 and renaming it.
Under technologies.lua for RA, I see:
data.raw["technology"]["energy-weapons-damage-6"].hidden = true

and:
type = "technology",
name = "rampant-arsenal-technology-energy-weapons-damage-6",

I did, as you advised, removed RA from the save and energy weapons 6 does re-appear as I expected. Not sure why yours didn't do it when you tried it but I can confirm that it should be Rampant Arsenal.

OK thanks for the investigation.
I don't know the rules wich mod should care of other. I am of the opinion the mod should fix it who breaks something ;-)
But I can build in a workaround that if "rampant-arsenal-technology-energy-weapons-damage-6" is present I use this.

The mods in question are not released for 1.1 but work if you modify the mod locale file to make it think it's 1.1. Those were changed by me. That would be awesome! I can provide those ones to you if you want. Or you can just grab the 1.0 version and change the file in the .zip.

To fix this issue I hat to publish my WIP feature for space exploration. If you experience any issue with this please create a new report.
You can contact me also on Discord / PN to kux#5599

With the current version of orbital ion cannon that we just tried to add to our server it is crashing on load with the same error as the OP. Rampant arsenal is fully released for 1.1 now and this mod is crashing with it (and SE as well if that matters) installed.

I know that rampant arsenal is causing the bug but it's doing so because it splits up the research into more types. It would be wonderful if this mod would adjust for when the technologies are adjusted as such, this is a wonderfully fun mod to have, especially with the rampant mods. 🙂

@OvermindDL1: The OP has no crash only a missing technology. If you have a crash please create a new report with the exact message.
I have testet the current version with the OP's saves game and I get no crash. but I need the message to localize the problem.

If you have a crash please create a new report with the exact message.

Will do. Thanks much!