Add a movieclip to an array instead of a generated object

programming flash
1

I am creating a platform game through the use of arrays, and i am inserting the platforms in a variable called blockHolder. I have successfully inserted generated blocks, but i want to insert my own movieclip, so i replaced this code:

Before:

else if (lvlArray* == 1)
                {//making a new block
                    var newBlock2:Block = new Block  ;
                    //drawing the block
                    newBlock2.graphics.beginFill(0x000000,1);
                    //turning the shape into a square;
                    newBlock2.graphics.drawRect(0,0,25,25);
                    //change the coordinates of the block;
                    newBlock2.x = (i - (colunas - 1) * lvlColumns) * newBlock2.width;
                    newBlock2.y = (colunas - 1) * newBlock2.height;
                    //then finally adding it to stage
                    blockHolder.addChild(newBlock);
                }

For this code:

if (lvlArray* == 1)
                {
                    //making a new block
                    newBlock = new platNev  ;
                    
                    //then finally adding it to stage
                    blockHolder.addChild(platNev);
                    
                    
                    
                }

And it gives the error: Implit coercion of a value of type class to an unrelated type flash etc. Any ideias?