Hello, i'd like to report a bug.
I tried loading some custom textures at 4k resolution for the trunk from Poly Haven:
https://polyhaven.com/a/tree_bark_03 however Tree It always crashes with a pop up error saying "Runtime error 506 - Could not load image at line 15372".
I attached the screenshot of the error.
I don't have any problem with the default textures that come with the software.
*Update* I tested out the same textures at 1k and 2k resolution by converting them in Affinity Photo and although the preview shows a black square, they are correctly displayed in the viewport without any crash.