We looked at the file and tried to replicate it. We had over 1000 entries in the list, and it is currently running without any problems (V184.108.40.206-rc). We noticed that you have a file in it that points to a system folder: "C:\Windows..." this is not recommended because administrator rights are required for this folder. So it may be that Python is trying to access it, throwing an error. As described in the documentation, it is recommended to store the files in the user folder.
I look forward to a reply.