I have Lunacy 6.1 bugs all the time. I have a dozen errors every minute, new ones are arriving in an avalanche. From my point of view, the current version is unusable.
I solved the problem by completely removing the x64 version (downloaded from the homepage) and installing version 6.1 from this source -> https://docs.icons8.com/release-notes/
I’m sorry you encountered these errors! Am I right they appeared in the direct download app version? Did you try to install the app from MS Store instead?