error cs1061

 Assets/GameContent/Motiontracks/Editor/AnimationImporter.cs(60,68): error CS1061: Type `UnityEditor.ModelImporter' does not contain a definition for `clipanimations' and no extension method `clipanimations' of type `UnityEditor.ModelImporter' could be found (are you missing a using directive or an assembly reference?)

So I was trying to import more Animations, I tried using other "clipanimation" extensions/directives. That didn't work. I really need your help. This is due tomorrow. The error is in the first line, Here's the code:

         ModelImporterClipAnimation = modelImporter.clipanimations;
             
 
             Object asset = AssetDatabase.LoadAssetAtPath(assetPath, typeof(GameObject));
             EditorUtility.SetDirty(asset);
             AssetDatabase.ImportAsset(assetPath, ImportAssetOptions.ForceUpdate);  
         }
     }
 
     private ModelImporterClipAnimation SetClipAnimationNew(string name, int firstFrame, int lastFrame, bool loop)
     {
         ModelImporterClipAnimation mica = new ModelImporterClipAnimation();
         mica.name = name;
         mica.firstFrame = firstFrame;
         mica.lastFrame = lastFrame;
         mica.loop = loop;
 
         if (loop)
             mica.wrapMode = WrapMode.Loop;
         else
             mica.wrapMode = WrapMode.Once;
 
         return mica;
     }
 }