“Hunk_AllocateTempMemory” message appears after getting kicked from an ET server. The “Hunk_AllocateTempMemory” error means that your ET game has not allocated enough memory for a map. There are custom maps which require more RAM memory, than the default allocated memory for your game.
You can change it by typing this in your console (press the ~ key):
Then reconnect ET (type /reconnect in console)
Note: you also can type a higher value instead of 128, but not more than 50% of your total RAM memory that you have in your computer.