The 2.8 port is compatible with the latest blender version (2.81a).
Judging from the error log, it looks like you are using a different version from the latest beta. Uninstall any old sprytile from the plugins menu (make also sure there's no sprytile folder left in C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons) and try installing the latest zip from this page: https://github.com/ologon/Sprytile/releases ( currently sprytile_2.8_beta8.zip)