Unity call couroutine of child object by parent

Hey Guys, I'm trying to call my IEnumerator of my sub class (which isn't a mono behaviour) using the parent class. Here's some code to explain it better: public class ChunkLoadingQueue {

     public ChunkManager chunkManager;
 
     List<Vector3i> queue = new List<Vector3i> ();
     public GameObject playerGO;
 
     public ChunkLoadingQueue(ChunkManager chunkManager) {
         this.chunkManager = chunkManager;
         chunkManager.voxelTerrain.StartCoroutine("loadChunksForPlayer");
     }
 
 IEnumerator loadChunksForPlayer() {
         while(true) {
             for (int x = 0; x < chunkManager.chunkData.GetLength(0); x++) {
                 for (int y = 0; y < chunkManager.chunkData.GetLength(1); y++) {
                     for (int z = 0; z < chunkManager.chunkData.GetLength(2); z++) {
                         float distance = Vector3.Distance(new Vector3(x * chunkManager.chunkSize, y * chunkManager.chunkSize, z * chunkManager.chunkSize), playerGO.transform.position);
                         if (distance < Player.renderDistance) {
                             if(chunkManager.chunkStates[x, y, z] == (int)ChunkState.None) {
                                 addChunk(x, y, z);
                             }
                         }else if (distance > Player.renderDistance) {
                             if(chunkManager.chunkData[x,y,z] != null){
                                 chunkManager.unloadChunk(x,y,z);
                             }
                         }
                     }
                 }
             }
             loadChunk();
             yield return null;
         }
     }}

I'm currently getting this error: Coroutine 'loadChunksForPlayer' couldn't be started! I've every code i've seen in other threads like creating a function in the mon-behaviour class which calls it etc. but none of them worked. Is it possible to start a coroutine from my "ChunkLoadingQueue" class?

Thanks in advance!