Hi all,

I had compile the contracts without error, however when migrate the following error appear?

~/EtherTrack/Truffle-project$ sudo truffle migrate
Warning: Both truffle-config.js and truffle.js were found. Using truffle-config.js.

Compiling your contracts...

Everything is up to date, there is nothing to compile.

Warning: Both truffle-config.js and truffle.js were found. Using truffle-config.js.
Warning: Both truffle-config.js and truffle.js were found. Using truffle-config.js.

Starting migrations...

Network name: 'development'
Network id: 123456
Block gas limit: 0x7a1200

1_initial_migration.js

Deploying 'Migrations'

transaction hash: 0x85595dfc88ce5439193331d5e517d75c831763fa3543c935620714c7b7a09bfc
Blocks: 0 Seconds: 36
contract address: 0x6bFcEe4E364161eee217EB2dF9967C5f7Ae1e3A4
block number: 10907
block timestamp: 1556817362
account: 0x51E37247B26E1d29eaAC8E550a6b2124F11B0061
balance: 53694.00220492
gas used: 269543
gas price: 20 gwei
value sent: 0 ETH
total cost: 0.00539086 ETH

Saving migration to chain.
Saving artifacts

Total cost: 0.00539086 ETH

2_deploy_basics.js

Deploying 'owned'

transaction hash: 0x595f7180b00e9cde2180d46b804e3a45299afc4f4bf3327acd62c61da4b42d38
Blocks: 0 Seconds: 28
contract address: 0xc1F65776Cf4A22b3Aa92D609EA37e042998eFCc3
block number: 10909
block timestamp: 1556817410
account: 0x51E37247B26E1d29eaAC8E550a6b2124F11B0061
balance: 53704.00220492
gas used: 200906
gas price: 20 gwei
value sent: 0 ETH
total cost: 0.00401812 ETH

Deploying 'mortal'

transaction hash: 0x7555170c36b992e815e74919dc597c2e9405c3d0cf68c3dc888cdb9e7635867d
Blocks: 0 Seconds: 4
contract address: 0x214728d177307300C8911254023C0BCF64cea224
block number: 10910
block timestamp: 1556817441
account: 0x51E37247B26E1d29eaAC8E550a6b2124F11B0061
balance: 53714.00220492
gas used: 200267
gas price: 20 gwei
value sent: 0 ETH
total cost: 0.00400534 ETH

Saving migration to chain.
Saving artifacts

Total cost: 0.00802346 ETH

2_deploy_core.js

Replacing 'owned'

transaction hash: 0x92b2f3be6bc00c813cb335dc35c796ad5f9ea075ab560852524ad637adc66d7d
Blocks: 0 Seconds: 4
contract address: 0xA48BFdf47C645638b79a9CfB88635fabcEC2e3d4
block number: 10914
block timestamp: 1556817463
account: 0x51E37247B26E1d29eaAC8E550a6b2124F11B0061
balance: 53729.00220492
gas used: 200906
gas price: 20 gwei
value sent: 0 ETH
total cost: 0.00401812 ETH

Replacing 'mortal'

transaction hash: 0x26533a41e74782a2d227a794f9ed3ba13fcd3549d1d0890b2e294d07af963b27
Blocks: 0 Seconds: 4
contract address: 0x2d27433e38a4A3856dE73b2aB51858938329c746
block number: 10915
block timestamp: 1556817472
account: 0x51E37247B26E1d29eaAC8E550a6b2124F11B0061
balance: 53734.00220492
gas used: 200267
gas price: 20 gwei
value sent: 0 ETH
total cost: 0.00400534 ETH

Saving migration to chain.
Saving artifacts

Total cost: 0.00802346 ETH

3_deploy_business.js

Deploying 'EtherTrackNS'

Error: *** Deployment Failed ***

"EtherTrackNS" -- invalid address (arg="parent", coderType="address", value="").

at /usr/lib/node_modules/truffle/build/webpack:/packages/truffle-deployer/src/deployment.js:364:1
at processTicksAndRejections (internal/process/task_queues.js:88:5)

Truffle v5.0.14 (core: 5.0.14)
Node v12.0.0

Because transactions logs are public, everyone get access to my stock.
Could you implement some kind of protected access ?

Dannys-Air:EtherTrack dannyng$ sudo truffle compile

Compiling your contracts...

✖ Fetching solc version list from solc-bin. Attempt #1
✖ Fetching solc version list from solc-bin. Attempt #2
✖ Fetching solc version list from solc-bin. Attempt #3
Error: Could not find a compiler version matching 0.5.16. Please ensure you are specifying a valid version, constraint or build in the truffle config. Run truffle compile --list to see available versions.
at VersionRange.errors (/usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/compilerSupplier/loadingStrategies/LoadingStrategy.js:66:1)
at VersionRange.getSatisfyingVersionFromCache (/usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/compilerSupplier/loadingStrategies/VersionRange.js:81:1)
at VersionRange.load (/usr/local/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/compilerSupplier/loadingStrategies/VersionRange.js:197:1)
Truffle v5.1.46 (core: 5.1.46)
Node v12.13.0