I got this error while running this command. python2 run_p2pool.py --dashd-address 127.0.0.1 --dashd-rpc-port 9998

Error getting work from dashd:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 653, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1442, in gotResult
_inlineCallbacks(r, g, deferred)
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
--- ---
File "/home/satosi/p2pool-lqx/p2pool/util/deferral.py", line 41, in f
result = yield func(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "/home/satosi/p2pool-lqx/p2pool/dash/helper.py", line 30, in getwork
work = yield go()
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 408, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "/home/satosi/p2pool-lqx/p2pool/util/jsonrpc.py", line 141, in _http_do
raise Error_for_code(resp['error']['code'])(resp['error']['message'], resp['error'].get('data', None))
p2pool.util.jsonrpc.NarrowError: -10 Dash Core is downloading blocks...