On A fresh install of OC 3.0.2, I installed Shoppica with no other plugins, as per instructions. Back end displayed correctly, and appeared to accept configs. Front end displays a 500 error. Live preview shows a blank screen. Ran the same trials with all caching disabled. Same Error.
Default theme shows no errors on front or backend. I have at this point installed and tested some mods to complete the rest of the build. Testing was done prior to those updates.