np.AxisError was added in numpy 1.13 #2455
Merged
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xarray/xarray/core/dask_array_compat.py
Line 47 in f9c4169
But AxisError was added in 1.13.
The fix is copied from Dask code: https://github.com/dask/dask/blob/0fb0f876bb974cfca1458903540ac389e6f89019/dask/array/utils.py#L15