No Farms Error in Joining Provisioning Server

I am attempting to join Citrix Provisioning Server with an existing farm but I encountered a "No Farms" error. There is an existing farm in the database. A friend told me that is caused by the Provisioning Server Version that is conflicting with each other. How can I confirm that? And also, how can I correct this error?

No Farms
There are no existing Farms.
OK
