I got the same error mentioned and after triaging this is what i found out:
Steps what was done
1) Restart the splunkd service after killing and starting it with admin privileges- Didnt work
2) Went to the directorty "Website Monitoring\website_monitoring\default"
Go to the file "website_monitoring.conf" and see if you have the right values entered. I had a value for "#thread_limit=" and i removed the same and saved the file again.All the entries were blank except for the thread limit. I removed the entry and tried again and i was able to proceed.
Please note that this worked for me and i am not sure if this would be the right solution.
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