When executing this function, I get an error gas required exceeds allowance (8000029) or always failing transaction i know that this error have when use transferFrom function. Where i wrong? help me please. thanks.
edit: walletOfGoods[msg.sender][_nameOfgood].price it is element of struct, type uint.
walletOfGoods it is struct where i save amount of goods. Struct contain is uint amounOfgood and uint price.
i use ropsten test
contract TRC20{
event Approval(address indexed _owner, address indexed _spender, uint256 value);
function approve(address _sender, address _spender, uint256 _value) public returns (bool success){
allowance[_sender][_spender] = _value;
emit Approval(_sender, _spender, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns(bool success){
require(_value<= allowance[_from][msg.sender]);
_transfer(_from, _to, _value);
return true;
}
function _transfer(address _from, address _to, uint _value) internal{
//require(_to!=0x0);
require(balanceOf[_from]>=_value);
require(balanceOf[_to] + _value>=balanceOf[_to]);
uint previousBalances = balanceOf[_from] + balanceOf[_to];
balanceOf[_from] -= _value;
balanceOf[_to] +=_value;
emit Transfer(_from, _to, _value);
assert(balanceOf[_from]+balanceOf[_to]==previousBalances);
}
function saleOfGoods(string memory _nameOfgood, uint _amountOfgood) public{
trc20 = TRC20(address(0x235F857D7947b9bC5Dc73f489B70Ef870e6263ed));
walletOfGoods[msg.sender][_nameOfgood].amountOfgood = walletOfGoods[msg.sender][_nameOfgood].amountOfgood.sub(_amountOfgood);
trc20.approve(address(0xeBa84a3f7d8d70955bEFF633098D8d6A3a6c18e5), msg.sender, walletOfGoods[msg.sender][_nameOfgood].price);
// Move to tokens to contract address
trc20.transferFrom(address(0xeBa84a3f7d8d70955bEFF633098D8d6A3a6c18e5), msg.sender, walletOfGoods[msg.sender][_nameOfgood].price);
}