Getting error at this line - database.storeProductReference(this);

pragma solidity >=0.4.21 <0.6.0;

import "./Database.sol";

/Constructor / contract Product { //Reference to its database contract address public DATABASE_CONTRACT; //Reference to its product factory. // address public PRODUCT_FACTORY;

// This struct represents an action realized by a handler on the product.
struct Action {
    //address of the individual or the organization who realizes the action.
    address handler;
    //description of the action.
    bytes32 description;
    // Longitude x10^10 where the Action is done.
    uint256 lon;
    // Latitude x10^10 where the Action is done.
    uint256 lat;

    // Instant of time when the Action is done.
    uint timestamp;
    // Block when the Action is done.
    uint blockNumber;
}

// if the Product is consumed the transaction can't be done.
modifier notConsumed {
    if (isConsumed)
    revert("not consumed");
    _;
}

// addresses of the products which were used to build this Product.
address[] public parentProducts;
// addresses of the products which are built by this Product.
address[] public childProducts;

// indicates if a product has been consumed or not.
bool public isConsumed;

// indicates the name of a product.
bytes32 public name;

// Additional information about the Product, generally as a JSON object
bytes32 public additionalInformation;

// all the actions which have been applied to the Product.
Action[] public actions;

function getNumberOfActions() public view returns(uint256) {
    return actions.length;
}

function getAction(uint index) public view returns(address, bytes32, uint256, uint256, uint, uint) {
    return (
        actions[index].handler, actions[index].description, actions[index].lat, 
        actions[index].lon, actions[index].timestamp, actions[index].blockNumber);
}

/////////////////
// Constructor //
/////////////////

/ @notice Constructor to create a Product @param _name The name of the Product @param _additionalInformation Additional information about the Product, generally as a JSON object. @param _parentProducts Addresses of the parent products of the Product. @param _lon Longitude x10^10 where the Product is created. @param _lat Latitude x10^10 where the Product is created. @param _DATABASE_CONTRACT Reference to its database contract @param _PRODUCT_FACTORY Reference to its product factory /

constructor (
    bytes32 _name, bytes32 _additionalInformation, uint256 _lat, uint256 _lon, address _DATABASE_CONTRACT) public {
    name = _name;
    isConsumed = false;
    additionalInformation = _additionalInformation;

    DATABASE_CONTRACT = _DATABASE_CONTRACT;
    //Action
    Action memory creation;
    creation.handler = msg.sender;
    creation.description = "Product creation";
    creation.lon = _lon;
    creation.lat = _lat;
    creation.timestamp = now;
    creation.blockNumber = block.number;

    actions.push(creation);

    Database database = Database(DATABASE_CONTRACT);
    database.storeProductReference(this);
}

// function () public { // // If anyone wants to send Ether to this contract, the transaction gets rejected // revert("no eth accepted"); //}

/ @notice Function to add an Action to the product. @param _description The description of the Action. @param _lon Longitude x10^10 where the Action is done. @param _lat Latitude x10^10 where the Action is done. @param _newProductNames In case that this Action creates more products from this Product, the names of the new products should be provided here. @param _newProductsAdditionalInformation In case that this Action creates more products from this Product, the additional information of the new products should be provided here. @param _consumed True if the product becomes consumed after the action. /

function addAction (
    bytes32 description, uint256 lat, uint256 lon, bool _consumed) public notConsumed {
    //if (newProductsNames.length != newProductsAdditionalInformation.length) revert();

    Action memory action;
    action.handler = msg.sender;
    action.description = description;
    action.lon = lon;
    action.lat = lat;
    action.timestamp = now;
    action.blockNumber = block.number;

    actions.push(action);
    isConsumed = _consumed;
}

function collaborateInMerge(address newProductAddress, uint256 lat, uint256 lon) public notConsumed {
    childProducts.push(newProductAddress);

    Action memory action;
   // action.handler = this;
    action.description = "Collaborate in merge";
    action.lon = lon;
    action.lat = lat;
    action.timestamp = now;
    action.blockNumber = block.number;

    actions.push(action);

    this.consume();
}

/* Function to consume the Product */
function consume() public notConsumed {
    isConsumed = true;
}

}

sandrinov / Pomi_SCTS

Getting error at this line - database.storeProductReference(this); #1