Lightroom mobile login not working (attempt to index a nil value)

I tried to login in to lightroom mobile on my mac, but lightroom keeps rejecting my login, saying I "attempt to index a nil value". This problem is independent from the catalog I use. Any advice?

Hi de Lachos,
1. Launch LR. Go to Edit > Preferences > Presets tab > click "Show Lightroom Presets Folder"
2.  rename the "Lightroom" presets folder to "Lightroom-x"
3. Quit and relaunch LR. It will ask you to manually find your catalog.
4. See if the problem went away.

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