Attribute Error in Asteria Notebooks

[EmmaTintinger]

Error:
AttributeError: module 'asteria.source' has no attribute 'initialize'

Locations:
-Detector_Response: cell [3]
-Load_Simulation: cell [3]
-Luminosity: cell [3]
-Simplemixing_Class: cell [2]
-Simulation_Handling: cell [4]
-Supernova_Mixing: cell [2]

Error trace from Detector_Response nb:

AttributeError Traceback (most recent call last)
Input In [3], in <cell line: 2>()
1 conf = config.load_config('../../data/config/default.yaml')
----> 2 ccsn = source.initialize(conf)
3 i3 = detector.initialize(conf)

AttributeError: module 'asteria.source' has no attribute 'initialize'