[Solved] Error on Addressables Build after Upgrade from preview 0-6-8 to 1.2.4

We are currently updating our app and wanted to incorporate the mroe stable production version 1.2.4.

We are currently on Unity 2018.3.14f1.

But everytime I try to build addressables I get two errors:

Code (CSharp):

1. InvalidOperationException: Sequence contains no elements
2. System.Linq.Enumerable.First[TSource] (System.Collections.Generic.IEnumerable`1[T] source) (at <1b13ba6391c74847bbc3eddc86df7eee>:0)
3. UnityEditor.Build.Pipeline.Tasks.CalculateAssetDependencyData.Run () (at Library/PackageCache/com.unity.scriptablebuildpipeline@1.5.2/Editor/Tasks/CalculateAssetDependencyData.cs:116)

and

Code (CSharp):

1. SBP ErrorException
2. UnityEditor.GenericMenu:CatchMenu(Object, String[], Int32)
3.  

I can't get it to work so if anyone has an idea what the problem might be, thank you in advance.

Edit: It seemed there was something wrong somewhere. Deleting the Library folder did help.

 

It didn't help. I am using Unity 2019.4.7