Packging error

Hello,

I am having a strange packaging error that I am trying to sort. The main error seems to derive from this line. I have looked up some stuff on the documentation and found my level may be too large. SO i used streaming levels, and I still have the same error. I would appreciate any help.

[File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Core\Public\Serialization/MemoryWriter.h