Hi Tercio,
Looking up this particular error, it seems to occur when assets are not being loaded due to some filename conflicts, along with some dependency issues related to some things that have been deprecated.
Since, as you have described, many assets in your project have been deleted, renamed, etc I would suggest the following:
- Make a back up of your entire Project Folder before proceeding
- Delete the intermediate and saved folders from the Project Folder remaining in your Unreal Projects folder
- Right-click on the Contents folder in the Content Browser and select “Fix up redirectors in folder”
- Save all
- Attempt to package
- If packaging fails, review log for “errors” to see if errors are the same or related to a specific file or files
- If the same, delete the DerivedDataCache folder from the engine directory (of the version you are packaging from)
- If packaging still fails, please post the latest output log as well as the project log