skmob.preprocessing.detection.stay_locations fail with column names LONGITUDE, LATITUDE, KeyError: "['lat', 'lng'] not in index"

[apiszcz]

What is the correct approach for calling stay_locations?

 
tdf

      UID                       datetime                                       wkt                         DATETIME  LONGITUDE   LATITUDE
0     156  2014-02-01 00:00:00.739166+01  POINT(41.8836718276551 12.4877775603346) 2014-02-01 00:00:00.739166+00:00  41.883672  12.487778
1     187  2014-02-01 00:00:01.148457+01  POINT(41.9285433333333 12.4690366666667) 2014-02-01 00:00:01.148457+00:00  41.928543  12.469037
type(tdf)
<class 'skmob.core.trajectorydataframe.TrajDataFrame'>

from skmob.preprocessing import detection
 staytdf = detection.stay_locations(tdf)
KeyError: "['lat', 'lng'] not in index"