Traceback (most recent call last):


 "C:\Users\staff\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pandas\core\indexes\base.py", line 2646, in get_loc

return self._engine.get_loc(key)


 "pandas\_libs\index.pyx", line 111, in pandas._libs.index.IndexEngine.get_loc


 "pandas\_libs\index.pyx", line 138, in pandas._libs.index.IndexEngine.get_loc


 "pandas\_libs\hashtable_class_helper.pxi", line 1618, in pandas._libs.hashtable.PyObjectHashTable.get_item


 "pandas\_libs\hashtable_class_helper.pxi", line 1626, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: '20'

Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/Users/my_name/.conda/envs/my_env_name/lib/python3.6/site-packages/vectorbt/__init__.py", line 519, in <module>

import vectorbt.signals.accessors


 "/Users/my_name/.conda/envs/my_env_name/lib/python3.6/site-packages/vectorbt/signals/accessors.py", line 873, in <module>

class Signals_SRAccessor(Signals_Accessor, Generic_SRAccessor):


 "/Users/my_name/.conda/envs/my_env_name/lib/python3.6/site-packages/pandas/core/accessor.py", line 190, in decorator

cls._accessors.add(name)
AttributeError: 'frozenset' object has no attribute 'add'
