'Local host:3000 not enough memory

Good evening, I am doing a coding course from udemy, my coding I have done has all of a sudden failed to not open on 2 laptops and one desktop computer.. how can I solve this issue please? It opens localhost:3000 but that’s as far as it gets and throws up failed to load page, not enough memory… The desktop I tried it on has 8gb ram and 1tb hdd.. what possible issue for this is there?



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