Frankly, looks like something that might happen if you have multiple instances of UE4 open, or you ran out of disk space, or something like that. It’s not related to the dialogue plugin, the plugin just happened to be in the log as part of files that can’t be processed for some reason.
Try deleting the following folders in your project: intermediate, saved, binaries, deriveddatacache. Then go into every plugin and delete their “binaries” and “intermediate” folders as well.
Then rebuild everything.