How can i fix this packaging error?

You can find the asset causing this by building the engine from source and adding breakpoints [here][1] and [here][2]. Loading the project then already triggers the breakpoints. In the stacktrace you can then find the call to UObject::Serialize(FArchive & Ar) which will reveal the name of the asset that is causing the issue:

In my case it was BT_Unit_Default. Which is a Behavior tree. I made a new Behavior tree and copied all the nodes into it and that fixed the issue. I guess it was some internal error in the behavior tree.

Please, help me with this issue! I am an architect (not a programmer) and i having some dificult to know what is happened.
I did an architecture waktrought aplication and i put some functions like “open the doors”, “change textures”, “turn on the ligths” e etc.
When i try to package, the output log shows this error: “UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogLinker: Error: Bad name index -1/131” and follow with this “UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed.” and this “UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure”
I’ve already read almost every issue in this answer hub and i didn’t find a solution.
The whole log is attached with this message.

link text

I’ve already saw your answer in other posts. The links in your message are offline and how can i use this “stacktrace” to find the call? Please be a little more paciente and explain how to do this step by step because there are many users that are not programmers and having the same issue.

You have to get the Unreal source and build it from that.
See: Downloading Unreal Engine Source Code | Unreal Engine Documentation
Then: Building Unreal Engine from Source | Unreal Engine Documentation
When you have access to the Unreal source those links will work.
Once you find the right files in Visual Studio setting a breakpoint is as easy as the right mouse button → add breakpoint. Once you hit the breakpoint it will look something like my image and you should be able to find the right entry there.