Extract report from Qlikview desktop_with python

Question

the part of the script with the error looks like this :

ActiveDoc = qvapp.OpenDoc(doc) # Open QlikView application print('Extracting:', qv_object_id) ActiveDoc.GetSheetObject(qv_object_id).Export(temp_path + 'temp.txt','\t') # Export object's data to temporary file df = pd.read_csv(temp_path + 'temp.txt', sep='\t' ,parse_dates=[0]) # Read previously exported data into Pandas print('Saving:', file_path) df.to_excel(file_path,sheet_name='Sheet1', index=False, engine='openpyxl') # Save data to its final destination

print('Extraction finished.')

qvapp.Quit()

while the error is this:

Traceback (most recent call last): File "C:\Users...\Desktop\test2.py", line 50, in ActiveDoc.GetSheetObject(qv_object_id).Export(temp_path + 'temp.txt','\t') # Export object's data to temporary file AttributeError: 'NoneType' object has no attribute 'Export'