The error message Record * in file * is being overridden by record * in file * signifies that a plugin erroneously overwrites a master record with a different type of record.
In the best case scenario these errors cause CTD. In the worst case scenario these errors cause mysterious and hard to troubleshoot issues only once the affected records are used dozens of hours into the game.
Depending on the record type, the engine might be using the original record, while the plugin that is doing the overwriting is not going to work properly because its record is being ignored or the engine uses the data from the overwriting plugin, potentially causing problems if other records, scripts etc. rely on data types from the original record.
For example, this can happen in case compacting form IDs for light plugin goes very wrong. The valid form ID range for new master records starts at 0x800. For any form ID below 0x800, the first two digits of the plugin load order ID are ignored. That means, any form ID below 0x800 in any plugin automatically overwrites records in Skyrim.esm or hardcoded records from the game *.EXE file. Make sure there are no unintentional overwrites of records that change their type and that the form IDs of new master records start at 0x800.
For example, this can happen in case a plugin injects records into another plugin and accidentally overwrites master records because that plugin was updated later.
If trying to look up the mentioned records in xEdit, adjust the load order ID (the first 2 digits for a full plugin or 5 digits for light plugin) to the actual file ID of the plugin when it is loaded into xEdit.
Reinstall or install the latest version of the plugin. Notify the author of the plugin about the problem if the error persists.
If removing a plugin lets the process run through without issues, it means the plugin is broken.
Temporarily disabling plugins is a troubleshooting step and not a fix. Avoiding or silencing an error message does not fix the error.
Ignore advice to only temporarily disable plugins to complete the process or claims that the plugin is fine to use.
Fix the error or permanently remove the broken plugin. Broken plugins should never be used in the game.