Solo mining doesnt works:
[2019-08-24 20:31:27] Empty data received in json_rpc_call.
[2019-08-24 20:31:27] getblocktemplate failed, falling back to getwork
[2019-08-24 20:31:27] Empty data received in json_rpc_call.
[2019-08-24 20:31:27] json_rpc_call failed, retry after 10 seconds
[2019-08-24 20:31:28] API bind to port 4048 failed - trying again in 20sec

what the problem?