Hello,
According to your post, we don't have enough information to clearly define where is the cause of the problem. First, make sure that your SolusVM server has properly configured virtual servers, nodes, node groups, templates, plans and API access.
You can find instructions on how to do it step by step on our Wiki:
http://www.docs.modulesgarden.com/SolusVM_Extended_VPS_For_WHMCS#Configuration_of_ProductIf the details are correct and the module is configured properly (but the problem persists), please open a support ticket and post your WHMCS admin area details and FTP details. We will check this in your environment and then we will be able to provide you with a solution.
Here you can open a support ticket:
https://www.modulesgarden.com/customers/supportWe are looking forward to hearing from you.