Looks like Sprytile simply does not work anymore with Blender 3.0, so unless the plugin is updated, the only way to use it is to a previous version relase of Blender, namely 2.8/2.9.
there is a push request on git with fix for 3.0. Just download the whole repository with a fix and install it (Code -> Download as ZIP) https://github.com/BlockCat/Sprytile
