"Overlapped I/O operation is in progress" while packaging

I tried to package my Project with 4.11P3 and I get the following error:

LogFileManager:Warning: ReadFile failed: Count=0 Length=1162163138 Error=Überlappender E/A-Vorgang wird verarbeitet. for file D:/Development/Mathias/Fernbus/GameProject/Fernbus411/Content/Maps/FernbusSim_Germany_x12_y16.umap

The error translated is:

Overlapped I/O operation is in progress

After this error the Automation Tool crashes because the deserialized Data is invalid. I get this error too, when trying to open the map directly in the editor. This only happens with some maps.

In 4.10.2 this maps loads without any problem.

It seems that the serialization of maps has changed. I identified a Blueprint as the cause of the crash. If this Blueprint was placed in the map in 4.10 then 4.11 cannot read the map. There is no problem, when I place this Blueprint in 4.11 but I have to convert our levels.


Could you please provide me with the full crash logs, as well as the error logs from the output logs within the engine? When you changed your version of the engine for your project from 4.10.2 to 4.11 Preview 3, did you convert it or make a copy of the project?

Looking forward to hearing back from you, thanks!

Hey ,

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you!