Transaction not yet indexed

PLex78cHFiLjtUFAqK7Ru2o1aZFukLaGFetLdzogi85aRAPqUSuSAJj78QuPUPUDPPDuGbkxnxdW2YAeJPMsLHq

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