Your daily Salesforce.com request limit has been exceeded. For most editions of Salesforce, Salesforce.com limits the number ...

Your daily Salesforce.com request limit has been exceeded.  For most editions of Salesforce, Salesforce.com limits the number of requests that can be made to its Web services per day on behalf of any tenant, and automated user provisioning relies on those Web services.  You may want to upgrade to a Salesforce edition that has higher limits or none at all.