cpuminer: Running two nodes -The requested URL returned error: 500 Internal Server Error, json_rpc_call failed, retry after 30 seconds
Because new blocks are not generated few days, I got this error.
To solve this I generate a new block using the bitcoin cli:
./bitcoin-cli --datadir=&lt;dir_to_wallet&gt; generatetoaddress 1 &lt;wallet_address&gt;