Keyword Search Ingest module error

Long story short. I want to use the Keyword Search in Autopsy. However, for reason I can’t get it to work.’
Below the images are basically the problems. Firstly, when I actually opened a new case, and was asked to configure the Ingest Modules, I did select “Keyword Search.” But when I did the error would then be displayed (third image below)

To reiterate the error it will say:
"Unable to start up one or more ingest modules, ingeset cancelled. PLease disabled the failed modules or fix the errors before restarting ingest.
Keyword Search: The index could not be opened or does not exist.

I am wondering how do I actually fix this issue? Because I really want to use the Keyword Search feature to simplify process faster.

Please help. Thank you.