tracks_manager serialization error

[CosmosHua]

from opensfm.dataset import DataSet
data=DataSet('xxx/odm-RTK/opensfm')
t=data.load_tracks_manager()
t.as_string()
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-7-83c65fbc4d47> in <module>
----> 1 t.as_string()
RuntimeError: Serialization from string not supported

As above, in the 286 branch of this OpenSfM, an error occurs when I try to serialize a tracks_manager, because you binarized the tracks.csv file.