Steps to Reproduce:
A number of OCR requests must already be in process.
Trying to run this tool gives the error message: ws_ocr_daemon robot is not running. Please try again later.
Instead, it should give an error message to the effect that the tool is too busy to accept any more requests at the present time.
See here for more details: https://en.wikisource.org/w/index.php?oldid=9244784#Requesting_the_activation_of_the_OCR_daemon