Transaction not yet indexed

ACk78webzuAE7fEXtHqqwQeGvQeUGAZuNu4P4hA9paRJxMGivKhvZq2pCVMz2aYkLQ1crNTmqGwSAgcGfqy9Rub

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.