id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
470322983,MDU6SXNzdWU0NzAzMjI5ODM=,3148,Unable to run example for xarray.DataArray.to_unstacked_dataset,19397429,closed,0,,,9,2019-07-19T13:25:03Z,2021-02-19T22:38:11Z,2021-02-19T22:38:11Z,NONE,,,,"Hello,

When I try to run the example for 
[xarray.DataArray.to_unstacked_dataset](http://xarray.pydata.org/en/stable/generated/xarray.DataArray.to_unstacked_dataset.html#xarray.DataArray.to_unstacked_dataset)

I get the error:

> Traceback (most recent call last):
  File ""<stdin>"", line 1, in <module>
  File ""/home/talfan/anaconda3/envs/to_unstacked/lib/python3.7/site-packages/xarray/core/dataset.py"", line 2915, in to_stacked_array
    ""dimensions {}."".format(dims)
ValueError: All variables in the dataset must contain the dimensions ('x',).

when running the line
`stacked = data.to_stacked_array(""z"", ['y'])`

This is my setup:

> pip freeze
certifi==2019.6.16
numpy==1.16.4
pandas==0.25.0
python-dateutil==2.8.0
pytz==2019.1
six==1.12.0
xarray==0.12.3+20.g9afe4d0c




Any idea what might be going wrong?

Many thanks for your help!","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/3148/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue