Gas Limit – Error ‘Gas Required Exceeds Allowance or Always Failing Transaction’ While Setting Address

I'm trying to do a data access control system with smart contract. I have 3 entity:

1. Client: who can get data and set address of Oracle
2. Oracle: who can add data and have getData() function
3. RBAC: Role based access control, who manage permission

The system has also 2 interfaces for Oracle and RBAC for principal functions. When I test the system on JavaScript VM (on Remix) all is okay and I haven't problem. But when I trying to deploy this system on my private blockchain it's doesn't work. When I trying to set the Oracle address in the client contract I have the problem: "gas required exceeds allowance or always failing transaction and the function doesn't work". I checked if I used the correct account (is a function callable only by the owner of the contract) and is ok.

Here my setOracleAddress() function code (in client contract):

//data oracle  
address internal oracleAddr = 0x0000000000000000000000000000000000000000;
OracleInterface internal oracle = OracleInterface(oracleAddr); 

    function setOracleAddress(address _oracleAddress) external onlyOwner returns (bool) {
    oracleAddr = _oracleAddress;
    oracle = OracleInterface(oracleAddr);  
    return oracle.testConnection();
}

Here's the testConnection() code (in oracle contract):

/// @notice can be used by a client contract to ensure that they've connected to this contract interface successfully
/// @return true, unconditionally  
function testConnection() public pure returns (bool) {
    return true;  
}

In my genesis blockchain block I've the follow gas limit:

"gasLimit"   : "0x8000000",

Here's how I get the Oracle address:

/// @notice gets the address of this contract  
/// @return address  
function getAddress() public view returns (address) {
    return address(this);
}

Modifier onlyOwner() code:

  /**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
    require(msg.sender == owner);
    _;
}

I tried to increase the gasLimit in genesis block, to check the correct account and to update the software (truffle, geth, web3).

EDIT:
I solved the problem of setting the address by adding to the genesis file the line

"ByzantiumBlock":0

But now I get the same error when I try to add test data.

Here's the code of addData() function:

    /// @notice puts a new pending data into the blockchain  
/// @param name descriptive name for the data (e.g. House001)
/// @param otherInfo about something like address (e.g. "Via roma 6, Torino")
/// @param sensorData sensor data
/// @return the unique id of the newly created data  
function addData(string memory name, string memory otherInfo, uint sensorData,  uint permissionMin, uint date) onlyOwner public returns (bytes32) {

    assert(permissionMin < rbac.getNumRole());

    //hash the crucial info to get a unique id  
    bytes32 id = keccak256(abi.encodePacked(name,otherInfo,date));  

    //require that the data be unique (not already added)  
    require(!dataExists(id));

    //add data
    uint newIndex = data.push(Data(id, name, otherInfo, sensorData, permissionMin, date, false))-1;  
    dataIdToIndex[id] = newIndex+1;

    //return the unique id of the new data
    return id;
}

Get numRole() function code:

uint numRole = 3;

 function getNumRole() public view returns(uint){
     return numRole;
 }

Struct Data code:

//defines a struct "Data"
struct Data {
    bytes32 id;
    string name;
    string otherInfo;
    uint sensorData;
    uint permission; 
    uint date;
    bool read;
}

Example of addData():

    /// @notice for testing  
function addTestData() external onlyOwner {
    addData("House001", "via Roma 2, Milano", 0,1, 20190504);

Error when forcing the execution

Any help? Thanks!!