What kind of error is this?

[Darthsaiber]

2020-05-14T03:16:18.268-0300 ERROR nodestats:cache Get held amount query failed
{“error”: “heldamount service error: protocol error: unknown rpc: “/heldamount.HeldAmount/GetPayment”;
heldamount service error: protocol error: unknown rpc: “/heldamount.HeldAmount/GetPayment”; heldamount
service error: protocol error: unknown rpc: “/heldamount.HeldAmount/GetPayment”; heldamount service
error: protocol error: unknown rpc: “/heldamount.HeldAmount/GetPayment”; heldamount service error:
protocol error: unknown rpc: “/heldamount.HeldAmount/GetPayment”; heldamount service error: protocol
error: unknown rpc: “/heldamount.HeldAmount/GetPayment””, “errorVerbose”: “group:\n— heldamount
service error: protocol error:
unknown rpc: “/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313\n— heldamount
service error: protocol error: unknown
rpc: “/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313\n—
heldamount service error:
protocol error: unknown rpc:
“/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313\n— heldamount
service error: protocol error: unknown rpc:
“/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313\n— heldamount
service error: protocol error: unknown rpc:
“/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313\n— heldamount
service error: protocol error: unknown rpc:
“/heldamount.HeldAmount/GetPayment”\n\tstorj.io/drpc/drpcwire.UnmarshalError:26\n\tstorj.io/drpc/drpcstream.
(*Stream).HandlePacket:156\n\tstorj.io/drpc/drpcmanager.(*Manager).manageStreamPackets:313”}