I’ve just hit this “AsyncApexTests Limit exceeded” error when I try to run tests in an org. Running the tests in a different way reports this:
To protect all customers from excessive usage and Denial of Service attacks, we limit the number of long-running requests that are processed at the same time by an organization. Your request has been denied because this limit has been exceeded by your organization. Please try your request again later.
But having to wait 24 hours before I can continue working? FUBAR.