running Ch1_Introduction_PyMC3, and get: TypeError: expected type_num 3 (NPY_INT16) got 9

[cloudsurging]

Hi,

I am running Ch1_Introduction_PyMC3 and the program runs smoothly until:

with model:
step = pm.Metropolis()
trace = pm.sample(10000, tune=5000,step=step)

the exception thrown out was:

TypeError Traceback (most recent call last)
C:\ProgramData\Anaconda3\lib\site-packages\theano\compile\function_module.py in call(self, *args, **kwargs)
902 outputs =
--> 903 self.fn() if output_subset is None else
904 self.fn(output_subset=output_subset)

TypeError: expected type_num 3 (NPY_INT16) got 9

During handling of the above exception, another exception occurred:

TypeError Traceback (most recent call last)
in ()
2 with model:
3 step = pm.Metropolis()
----> 4 trace = pm.sample(10000, tune=5000,step=step)

Could you please help us identify how to fix this issue?