When you run your package, Salesforce returns the following error: "Async API not enabled".
Looks like your Salesforce edition does not support Asynchronous API (Bulk API). It is enabled by default for the following editions: Enterprise, Performance, Unlimited and Developer. For more information, please refer to https://help.salesforce.com/apex/HTViewSolution?id=000214395&language=en_US
You need to contact Salesforce support in order to enable Asynchronous API in Salesforce Professional edition. For more information, please refer to https://developer.salesforce.com/forums/?id=906F00000008rW5IAI
If you have not asked the Salesforce support team to turn on Bulk API for your Salesforce Professional account, you can clear the "Use Bulk API" check box in your Salesforce connection in order to work with Salesforce Professional.