emcee: AutocorrError, 'The chain is too short to reliably estimate the autocorrelation time'

I’ve been using emcee without any problems for a while. Recently I tried running my program in Windows10, but I get an error with the autocorr (that I didn’t get before). Using the quickstart.py example I get the same problem but I can’t figure out whats wrong whatsoever. I hope you can help me figuring out whats wrong . This is the log I get running quickstart.py :

In [1]: run quickstart.py
Mean acceptance fraction: 0.191032
---------------------------------------------------------------------------
AutocorrError                             Traceback (most recent call last)
C:\Users\anibal\Documents\GitHub\emcee\examples\quickstart.py in <module>()
     58 # Estimate the integrated autocorrelation time for the time series in each
     59 # parameter.
---> 60 print("Autocorrelation time:", sampler.get_autocorr_time())
     61
     62 # Finally, you can plot the projected histograms of the samples using

C:\Users\anibal\Anaconda2\lib\site-packages\emcee-2.2.1-py2.7.egg\emcee\ensemble.pyc in get_autocorr_time(self, low, high, step, c, fast)
    501         return autocorr.integrated_time(np.mean(self.chain, axis=0), axis=0,
    502                                         low=low, high=high, step=step, c=c,
--> 503                                         fast=fast)
    504
    505

C:\Users\anibal\Anaconda2\lib\site-packages\emcee-2.2.1-py2.7.egg\emcee\autocorr.pyc in integrated_time(x, low, high, step, c, full_output, axis, fast)
    116             break
    117
--> 118     raise AutocorrError("The chain is too short to reliably estimate "
    119                         "the autocorrelation time")
    120

AutocorrError: The chain is too short to reliably estimate the autocorrelation time