Virtualizor team has updated the Blesta module.
We have updated the Blesta module as on the latest version of Blesta, Plans were not loaded when you select the Server and due to that user were not able to save the product.
We have fixed this and we recommend to update the Blesta module.
Please let us know if you face any issues / you have any suggestions regarding module.
We will resolve it asap and try to improve it asap.