This is a very weird error that I get when I follow simple steps. To reproduce you just need to: Create a new project. Install addressables. Create a test script that is going to instantiate AssetReference on Start. Make a prefab of Cube. Mark it addressable. Build addressables. Use built bundle for testing in the editor. Run playmode, it should work fine and instantiate the cube. Build Settings -> Build -> Create a folder named: Builds in directory containing Assets. Builds -> Create a folder named: something very long like "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa". Build project in that folder. Run the project -> Open player log -> See error. So after 5-6 hours of pain, I actually renamed the folder to a shorter version something like `aaaa` and my previous build started working Here is the screenshot of all of my builds and a log with an error attached when I try to instantiate an addressable with name: "Cubero", the shorter named ones are working, first I thought that the max number of characters was 25, but then it didn't work with some folder names, idk what the problem is.