Review Request: 220V TRIAC Voltage Stabilizer using LM358 and UJT

Hello, I have been tasked to build a Voltage stabilizer (220V, 50Hz). Now I am newbie at this and I dont want to offend anyone here (lol) but I have used Google Gemini to build a circuit. I have made the circuit in proteus 8 but it shows some errors for reasons unknown, gemini tells me its simply due to proteus mathematical model failing or something. So i have decided to make it in hardware, but for obvious reasons i am a little scared, so please take a look at my circuit if you will and let me know if i should proceed. The circuit uses a UJT to generate pulses for a triac to fire and op amp has been used to control the angle of the UJT pulses firing, an optocoupler has been used for isolation. I have attached the circuit and the error message screenshot in proteus. Thanks