GPT just can't reply normally

Today,when i try to write some code, and let GPT-4 or GPT-4o to fix my code,it just reply as below:
It looks like I’ve hit the memory limit for context! I can still assist you with your current questions or tasks, but I won’t be able to recall earlier information in this session. How can I help you today?
so i wonder, what can i do? am i the only one encountering such issue?