Refinement script: buildDepthMaps & PointCloud

[Dark_Corvid]

I'm trying to create a script that refines data in an existing .psx file. After loading the file,  I try to run chunk.buildDepthMaps and receive "Error: Null point cloud" even though a sparse point cloud exists in the .psx.

Any ideas?

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#SFB Get reference to the currently active DOM
doc = Metashape.Document()

#AIW Attemtps to open an existing project.
# - A new project is created if an existing project is not available.
# - This must be done immediatly after getting reference to active DOM.
# - .psx format will not save correctly otherwise.
try:
    doc.open("{}{}.psx" .format(PATH_TO_IMAGES, IMAGE_PREFIX), read_only=False, ignore_lock=True)
except:
    print("No document exists!\nCreating a new document.")
    doc.save("{}{}.psx" .format(PATH_TO_IMAGES, IMAGE_PREFIX))

#AIW Adds a chunk to the current document.
chunk = doc.addChunk()

#SFB Build the list of image filenames
images = []
for image in range(1, 121):
    filename = ("%s%s%04d.tif" %(PATH_TO_IMAGES, IMAGE_PREFIX, image))
    images.append(filename)
print(images)

#SFB Indicate processing is starting
sys.stdout.flush()
print("\nStarting processing:")
start = time.time()

#AIW From API "Add a list of photos to the chunk."
# - Must be run before getting a reference to camera.
phaseTime = time.time()
PHASE_LABEL = "Adding Photos"
chunk.addPhotos(images, progress=progress_callback)
print_time_elapsed(phaseTime)
doc.save()

#AIW Getting reference to camera. Index is out of range if not run after chunk.addPhotos.
camera = chunk.cameras[0]

#AIW From API "Generate depth maps for the chunk."
# - First step of the Metashape GUI "Workflow" process called "Dense Cloud".
phaseTime = time.time()
PHASE_LABEL = "Building Depth Maps"
chunk.buildDepthMaps(quality=Metashape.LowQuality, filter=Metashape.AggressiveFiltering, progress=progress_callback)
print_time_elapsed(phaseTime)
doc.save

[Dark_Corvid]

I changed

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chunk = doc.addChunk() to

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chunk = doc.chunk and that solved my issue currently.