How to display many objects in Three.js?

Hello, I am working on an interactive site that is divided into blocks (4 blocks) of the fullpage.js plugin. Each block has three pop-ups and 3D models.
One of the blocks (the block with the ground) has a background written in three.js, I try to embed a popup with a model there, but the console tells me: WebGL: INVALID_OPERATION: uniform3fv: location not from the current program.
Please help me to solve the problem.

UPD: to clarify the structure of the site a little

on other blocks, the background is not three. I need it to look the same as here:
click model: