services.index_stats gives jsonrpc protocol error #1

When services.index_stats is called, it produces a jsonrpc protocol error. Traceback follows:

kvasir.call.test.services.index_stats()
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/KvasirAPI/jsonrpc/services.py", line 87, in index_stats
return self.send.service_rpt_index_stats(hostfilter)
File "/usr/local/lib/python2.7/dist-packages/jsonrpclib/jsonrpc.py", line 288, in call
return self.__send(self.__name, args)
File "/usr/local/lib/python2.7/dist-packages/jsonrpclib/jsonrpc.py", line 238, in _request
check_for_errors(response)
File "/usr/local/lib/python2.7/dist-packages/jsonrpclib/jsonrpc.py", line 567, in check_for_errors
raise ProtocolError((code, message))
jsonrpclib.jsonrpc.ProtocolError: (-32099, u'Server error')