So I opened up Blender and, for the second time, materials have suddenly changed to the standard pink colour. The materials themselves have changed to this pink colour; the doors and the floor weren't purple before and this is how I found the materials when I opened Blender. Blender was closed, it wasn't running on the background before I opened it. The textures come from Polyhaven, they're downloaded(they're not form Polyhaven's add-on). The materials come in the form of meshes. I apply them by using the drop down menu, next to the search bar, in the material properties menu. Before this happend, there were no problems with these textures. I did have the same problem with other Polyhaven materials. In the UV-Editor there isn't and wasn't a texture Furthermore I'm using Blender v.3.0.0, using Eevee as render engine. I've never had problems like this with materials, except for the case described in this text. I'm a beginner in Blender, so I'd like a detailled awnser. Thanks in Advance :)
Here you see the materials have changed to the standard purple colour. The doors have different materials than the floor: the floor has the material 'herringbone_parquet' and the doors have the material 'dark_wood'.