Failed to send work to proxy

[ShengguangXiao]

[ 8374][19-01-17T07:02:34.484][c/libPOW/pow.cpp:376][SendWorkToProxy ] Json value send out: [
"0x02eaa9479fcf622bbd4f1362573006c51d3b8b22aa6f6fc0d28c7dfc0f4bf341b0",
"0x891ce62b2fee23f4bb8bf7d1a56cd3a4f05866d34a57433da5668b792f0653f5",
"0x00000000000003e8",
"0x1fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"0x00000096",
"0x95A333212E2E8EE68C3FAAFF44C0E5016981C09F22BCA424033AFF18DA5E3F6D8C04EC8467627BACB04CC5D79E30F087A4B7DECE555EA03EDD4D16E02E4C790C"
]
[ 8374][19-01-17T07:02:35.060][c/libPOW/pow.cpp:386][SendWorkToProxy ] Exception captured in jsonrpc api zil_requestWork, exception: Exception -32603 : INTERNAL_ERROR: : {"jsonrpc":"2.0","error":{"code":-32000,"message":"Server error","data":"FieldDoesNotExist: The fields "{'balance'}" do not exist on the document "ZilNode""},"id":1}
[ 8374][19-01-17T07:02:35.060][c/libPOW/pow.cpp:318][SendWorkToProxy ] END

[ShengguangXiao]

Need to clear the old database before start the server. First go to folder Zilliqa-Mining-Proxy/zilpool/tests/scripts, and run script ./drop_db.sh
~/Zilliqa-Mining-Proxy/zilpool/tests/scripts$ ./drop_db.sh

[Canefis]

I have a similar error:
[ 8374][19-01-17T07:02:35.060][c/libPOW/pow.cpp:386][SendWorkToProxy ] Exception captured in jsonrpc api zil_requestWork, exception: Exception
[ 8374][19-01-17T07:02:35.060][c/libPOW/pow.cpp:318][SendWorkToProxy ] END
RemoteMine Failed to send work package to mining proxy
How to solve it?