I specifically recieved the same error when I was attempting to access the jungle portal in Impressive World (Another Impressive Title server different from DoE.)
Problem: Your RAM (Random Access Memory) hardware (it's those green chips with black squares set underneath your laptop or inside your tower desktop) is not sufficent in processing size to handle the complicated texture files from that Forest portal you're trying to access.
Solution: Purchase RAM with greater memory capacities (I suggest you to get 2x sticks of 4 GB which equal to a total of 8 GB memory.) or purchase a new laptop with better capablities.
I attempted solution 1 and it worked on my laptop. I Hope this helps.

Note: I'm a computer geek so don't take the tech terms and acronyms too seriously lol.