An un-handled exception was caught by salt's global exception handler

gistfile1.txt

[ERROR   ] An un-handled exception was caught by salt's global exception handler:
TypeError: string indices must be integers, not str
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 11, in <module>
    salt_call()
  File "/usr/lib/python2.7/dist-packages/salt/scripts.py", line 123, in salt_call
    client.run()
  File "/usr/lib/python2.7/dist-packages/salt/cli/__init__.py", line 410, in run
    caller = salt.cli.caller.Caller.factory(self.config)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 64, in factory
    return ZeroMQCaller(opts, **kwargs)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 87, in __init__
    self.minion = salt.minion.SMinion(opts)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 265, in __init__
    self.gen_modules()
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 277, in gen_modules
    self.opts['environment'],
  File "/usr/lib/python2.7/dist-packages/salt/pillar/__init__.py", line 91, in compile_pillar
    ret_pillar = self.sreq.crypted_transfer_decode_dictentry(load, dictkey='pillar', tries=3, timeout=7200)
  File "/usr/lib/python2.7/dist-packages/salt/transport/__init__.py", line 245, in crypted_transfer_decode_dictentry
    aes = key.private_decrypt(ret['key'], 4)
TypeError: string indices must be integers, not str