Artifact correction error when not using isosbestic

[saraemily23]

Hello -- I am reanalyzing some data to see what it looks like without using my isosbestic control. I find that, for files that require artifact removal, the program hangs when I re-run the "Extract Timestamps" step. I see the following error in my terminal:

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Removing Artifacts from the data and correcting timestamps...
Computing z-score for each of the data...
Remove Artifacts : True
Optimal parameters not found: Number of calls to function has reached maxfev = 800.
Traceback (most recent call last):
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 1235, in
raise e
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 1229, in
extractTsAndSignal(json.loads(sys.argv[1]))
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 1216, in extractTsAndSignal
execute_zscore(folderNames, inputParameters)
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 1156, in execute_zscore
compute_z_score(filepath, inputParameters)
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 999, in compute_z_score
z_score, dff, control_fit = helper_z_score(control, signal, filepath, name, inputParameters)
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 919, in helper_z_score
control_arr = helper_create_control_channel(signal[tsNew_index], tsNew[tsNew_index], window=101)
File "C:\Users\sem\GuPPy-main\GuPPy\preprocess.py", line 100, in helper_create_control_channel
control = curveFitFn(timestamps,*popt)
UnboundLocalError: local variable 'popt' referenced before assignment

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These are all files that have previously been successfully analyzed (with the isosbestic control). Is this a bug, or am I doing something wrong?