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Project has available credits, but participant got error message about credits

URL of experiment:

Description of the problem:
Dear experts,

I just encountered a issue with pavlovia credits. My project has enough credits to run participants, see below:
Screen Shot 2021-08-31 at 5.48.22 PM

However, the multiple participants were claiming the missing credits error and cannot open the study:
Screenshot 2021-08-31 173535

I searched online for a while and did not find a solution. Any suggestion counts. Thank you!