c# - OnMouseDown event, NullReferenceException: Object reference not set to an instance of an object -

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im new unity3d c#. im trying make simple puzzle15 game.

when click on each tile trying current tile coordinates , empty tile coordinates in order move current tile. tile objects instantiates in gameboard.cs class has move() method , trying run method onmousedown() method class tileparams.cs created store coordinates each tile. tileparams.cs attached tileprefab instantiate tiles from.

i`ll not give of code, part getting error from.

public class gameboard : monobehaviour { ... ... ... void instantiatetile(int tilenum, int x_coord, int y_coord) {     settileposition (x_coord, y_coord);     tileobject [tilenum] = instantiate (tileprefab, new vector3 (tile_x, tile_y, 0), tileprefab.transform.rotation) gameobject;     tileobject [tilenum].transform.findchild ("tilenumber").gameobject.getcomponent<textmesh> ().text = tilenum.tostring();     tileobject [tilenum].getcomponent<tileparams> ().setx_coord (x_coord);     tileobject [tilenum].getcomponent<tileparams> ().sety_coord (y_coord); }  void puttilestogameboard() {     ...     ...     ...      instantiatetile (tilesquantity, x_coords[tilesquantity], y_coords[row]);    // instantiating empty tile     tileobject[tilesquantity].transform.findchild("tilenumber").gameobject.getcomponent<textmesh>().text = "";     tileobject [tilesquantity].getcomponent<meshrenderer> ().enabled = false;     debug.log (tileobject [tilesquantity].getcomponent<tileparams> ().getx_coord ()); // here works      (int tilenum = 1; tilenum < tilesquantity * tilesquantity; tilenum++)     {         if (tilenum % tilesquantity == 0)         {             row++;             col = 1;             shufflearray(x_coords);         }          instantiatetile(tilenums[tilenum], x_coords[col], y_coords[row]);         //debug.log(tilenum + "\t" + x_coords[col] + "\t" + y_coords[row]);         col++;     } }  public void move(tileparams currenttile){     debug.log (tileobject [tilesquantity].getcomponent<tileparams> ().getx_coord ());  //here getting error }

and tileparams.cs class:

public class tileparams : gameboard {  private int x_coord; private int y_coord; ... ... ... public void setx_coord(int x_coord){     this.x_coord = x_coord; }  public void sety_coord(int y_coord){     this.y_coord = y_coord; }  public int getx_coord(){     return x_coord; }  public int gety_coord(){     return y_coord; }  void onmousedown (){     move (this); }

so,when click on each tile throws "nullreferenceexception: object reference not set instance of object ". appreciated. thank you.


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