I am trying to mine on an old AMD Radeon HD 57xx GPU with Catalyst version 15.7.1 on a Windows10 x64 machine.
Claymore's CryptoNote GPU Miner v9.4 receives the following error from the pool
{"id":1,"jsonrpc":2.0","error":{"code":-1,"message":"Lowdifficultyshare"}}
This topic on bitcointalk suggests to use a particular algorithm for such card (-a 3 switch).
What does "Low Difficulty Share" error mean in this context?