This seems like something that is caused by the asset not being cooked into the project. This could be due to the references being made to it. If you are calling the line of code you posted on construction on a class that is being referenced by a map that you are cooking, it should be included automatically. I had this work correctly on both Windows and Android placing a Blueprint of the following class in the map: Pastebin.
However, if it is being called somewhere like BeginPlay, the editor doesn’t recognize that this asset is ever being referenced in the maps that are being cooked so it doesn’t cook it into the package. If this is the case, you can fix this by adding the asset’s folder to the “Additional Asset Directories to Cook” in Project Settings > Packaging under the expanded settings. This will force the asset to be cooked even if it isn’t being referenced.
Thx for your reply, but it doesn’t work, even I added “Additional Asset Directories to Cook” and checked “cook everything in the project content directory”, LoadObject always return NULL in BeginPlay function.
If LoadObject in Construct of MyUserWidget, Server would crash when startup
I uploaded log file of Server when startup link text