I didn't find the final solution but with a hotfix you can fly mod A-4E-C!
HOTFIX: disable altitude radar (this also disables the radar screen that causes the BUG)
All you have to do is comment out (adding --) the line that starts the altitude radar in the following file:
C:\Users\User\Saved Games\DCS\Mods\aircraft\A-4E-C\Cockpit\Scripts\device_init.lua
The line in question would look like this:
--creators[devices.RADARWARN] = {"avLuaDevice" ,LockOn_Options.script_path.."Systems/radarwarn.lua"}
Next I add a screenshot of the file and another one that is the proof that I was able to fly this mod.