AsyncGPUReadback.RequestIntoNativeArray - owner has been invalidated

i have next code :

 private void Start()
 {
     CreateBuffer(ref _data, ref _rt);
     StartCoroutine(StartEncoding(_rt,isLoging));
 }


 System.Collections.IEnumerator StartEncoding(RenderTexture oRTs, bool active)
 {
    
     while (active)
     {
       
         yield return new WaitForEndOfFrame();
         
         AsyncGPUReadback.RequestIntoNativeArray(ref _data, oRTs, 0, request =>
         {
             if (request.hasError) { Debug.Log("GPU readback error detected."); return; }
             Debug.Log("in Function ");
             // encode to png and save 
             Debug.Log( "saved PNG file ");
            
         });
     }
 }

Before even the first frame ends i get next error : 1[System.Byte] can no longer be accessed, since its owner has been invalidated .

What is happening ? i can get date to be used once and then i can not use it anymore ? My Q is how i can use AsyncGPUReadback.RequestIntoNativeArray corectly so i do not lost acces to my NativeArray ?