After removing/deleting a file from a project I ran into a warning on start-up where the removed file was trying to be loaded and couldn’t be found (Failed to load '/Game/DT_DataTable': Can't find file.).
I tried reconciling offline work but that didn’t seem to fix the issue and remove the warning.
The way I solved it, if reconciling offline work doesn’t work, is just opening up the asset, compiling it and saving it.