Pylon problems

Hi all! I'm playing Terraria on a PC and the Don't Starve seed. I have a forest pylon that I can't place. I have two nearby, happy NPCs in the forest biome. I don't have any other forest pylons already placed. I've tried several different locations. I have successfully installed both the ocean and desert pylons already and would appreciate some help to figure out what's going on T_T Thank you in advance!!
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