New on UHRS, get an error message every time I try and start a task

Every time I try and start a Hit I get an information box that pops up saying:

"There are no hits available. It could be that all hits are leased out. Please try again later."

For every one of them! Am I doing something wrong? Every time I click on one I do the Preview first and test out the task. I've cleared my cache. Anything else I should try? Patience? 😅