pynfs 3 failure

Traceback (most recent call last):
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/./testserver3.py", line 374, in <module>
    main()
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/./testserver3.py", line 331, in main
    env.init()
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/server3tests/environment3.py", line 70, in init
    self.rootfh = type3.nfs_fh3(self.c1.mntclnt.get_rootfh(self.opts.path))
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/nfs3client.py", line 118, in get_rootfh
    res = self.proc(MOUNTPROC3_MNT, arg, 'mountres3')
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/nfs3client.py", line 96, in proc
    xid = self.proc_async(procnum, procarg, **kwargs)
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/nfs3client.py", line 92, in proc_async
    arg_packer(procarg)
  File "/home/ffilz/ganesha/bf-pynfs/nfs4.1/xdrdef/mnt3_pack.py", line 41, in pack_dirpath
    self.pack_string(data)
  File "/usr/lib64/python3.9/xdrlib.py", line 108, in pack_string
    self.pack_fstring(n, s)
  File "/usr/lib64/python3.9/xdrlib.py", line 100, in pack_fstring
    data = data + (n - len(data)) * b'\0'
TypeError: can only concatenate str (not "bytes") to str
RC = 1
----- FAILURE -----