Output error-log
1  | write_log(err_file, flag_nocattle, now_scraping, lng_ids)
 | 
err_file | 
 Path to the error log file  | 
flag_nocattle | 
 Flag whether an error had occured due to no cattle in the database.  | 
lng_ids | 
 Length of IDs  | 
now_scrapoing | 
 Index of ID of current scraping cattle  | 
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