Question How to release multiple addressables from the same or multiple label?

Sorry if this question was asked before. Couldn't find it in the forum.

Problem: I Instantiate some GameObjects(Addressables) inside a grid. My plan is now to release all spawned GameObjects with a button for example. Somehow I don't get my head around how to do this the proper way. Currently, I get this error when I use Addressables.Release(_loadHandle): Attempting to use an invalid operation handle.

Has someone an Idea what I'm doing wrong?

Code (CSharp):

1. private void DoVoxelGrid() {
2.         for (int x = 0; x < width; x++) {
3.             for (int y = 0; y < height; y++) {
4.                 for (int z = 0; z < length; z++) {
5.                     var pos =  center + new Vector3( x, y, z ) * threshold;
6.  
7.                     _loadHandle = Addressables.LoadAssetsAsync<GameObject>(assetLabelReferences, addressable => {
8.                         Instantiate(addressable, pos, Quaternion.identity);
9.                     }, Addressables.MergeMode.Union, true);
10.                 }
11.             }
12.         }
13.     }