An error occurred. Either the engine you requested does not exist or there was another issue processing your request

I am getting this error in GPT 4. There is not much information on how to resolve it.
Error message -
An error occurred. Either the engine you requested does not exist or there was another issue processing your request. If this issue persists please contact us through our help center at help.openai.com.

This problem was posted earlier as well, however, I couldn’t find any proper resolution.
Can anyone help me to resolve this?