[Ethereum] This contract may be abstract, not implement an abstract parent’s methods completely or not invoke an inherited contract’s constructor correctly

Contract ERC20Detailed inherits from interface IERC20, which declares the following functions:

function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

Hence any contract which inherits from contract ERC20Detailed needs to implement these functions in order to be deployable.

You might also need to get rid of the abstract prefix at the beginning of your contract declaration. I'm not familiar with this keyword myself (it was probably added to the language only recently), but I believe that it tells the compiler that the author's intention is to leave some functions unimplemented.