Error in WHMCS SolusVM 2 Pre Paid billing module: No available compute resources exist

Symptoms 

SVM_ERROR: Failed to place new order: Client error: `POST https://strs.dedigo.fr/api/v1/servers` resulted in a `400 Bad Request` response: { "message": "No available compute resources exist." } resources and everything is ok:  free disk space, memory everything and ipv4 free

Cause

A WHMCS module misconfiguration.

Resolution

For example: a plan with backups and there's no backup node assigned.

Checking the following:

1. Log in to SolusVM 2 admin panel
2. Browse to SolusVM 2 > Backups > Backup Nodes -> Edit set corresponding Backup Node
3. Select the newly added CR in Compute Resources field

 
Second example: an incorrect storage set:

1. Go to Compute Resources > CR_name > Storage tab and check what storage types are enabled
2. Go to Plans, find a plan that you used in WHMCS, and verify that it has the same storage plan
    
   Reference guide for WHMCS module configuration:
   

   https://docs.solusvm.com/v2/billing-integration-guide/prepaid-billing/SolusVM-2.0-product/Creation%2Bof%2Ba%2Bproduct.html (Configurable Options and SolusVM 2 product parts)