We had major problems when we assembled the unit.  The holes where the plastic anchors were placed,  were  not deep enough, but the anchors were forced in anyway.  When we tighten the cam locks, they pulled out.  Had to re drill the holes and re glue the plastic anchors in with super glue gel.  Waited over night for them to dry.  Once that was done was easy to assemble.  Before you start to assemble, check to see if the plastic plugs are in as they should be.  If they are easy to do, if not take the plugs out and drill the holes deeper, and glue plugs in as should be.