Cloud Swarm 2 Help Required Please

I have recently installed Cloud Swarm 2 - Unmanaged Package v2.2 into our Sandbox environment. I am able to access the 'Opportunity Swarm Rules' tab and set up individual rules, however when I access the 'Opportunity Swarm Rule Wizard' tab I get the following error:

'Collection size 1,359 exceeds maximum size of 1,000.'

The same error occurs for the 'Case Swarm Rule Wizard' tab too.

Has anyone experienced this or able to help me please?

Thanks,

Marco