在使用我的服务器在Litecoin和Dodge的P2Pool上进行合并挖掘时，我一直遇到这个P2Pool错误，我不确定如何为我的挖掘池修复它。
2018-07-06 10:23:44.007699 p2pool (version 13.4-369-g909ac93)
2018-07-06 10:23:44.007801
2018-07-06 10:23:44.007899 Testing bitcoind RPC connection to 'http://127.0.0.1:7990/' with username 'litecoinrpc'...
Error while checking Bitcoin connection:
Traceback (most recent call last):
Failure: twisted.internet.error.ConnectionRefusedError: Connection was refused by other side: 111: Connection refused.
^[[CError while checking Bitcoin connection: