Having issues running ryu-manager . Getting the following error .

-VirtualBox:~/Downloads/ryu-master$ sudo ryu-manager
Traceback (most recent call last):
  File "/usr/local/bin/ryu-manager", line 9, in <module>
    load_entry_point('ryu==3.0', 'console_scripts', 'ryu-manager')()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 337, in
load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2279, in
load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1989, in
load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/local/lib/python2.7/dist-packages/ryu/cmd/manager.py", line
43, in <module>
    from ryu.topology import switches
  File "/usr/local/lib/python2.7/dist-packages/ryu/topology/switches.py",
line 427, in <module>
    class Switches(app_manager.RyuApp):
  File "/usr/local/lib/python2.7/dist-packages/ryu/topology/switches.py",
line 434, in Switches
    LLDP_PACKET_LEN = len(LLDPPacket.lldp_packet(0, 0, DONTCARE_STR, 0))
  File "/usr/local/lib/python2.7/dist-packages/ryu/topology/switches.py",
line 391, in lldp_packet
    pkt.serialize()
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/packet/packet.py",
line 74, in serialize
    data = p.serialize(self.data, prev)
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/packet/ethernet.py",
line 61, in serialize
    self.ethertype)
struct.error: argument for 's' must be a string
-VirtualBox:~/Downloads/ryu-master$
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