UPDATE

terroa/variables.tf

@@ -8,4 +8,4 @@ variable "network" { default = "default" }   # you need to change this
 variable "pool" { default = "cscloud_private_floating" } #ip name/UUID
 variable "server1_script" { default = "./server1.sh" }
 variable "security_description" { default = "Terraform Debian security group" }
-variable "security_name" { default = "Debian_securityMat_test_ev" }
+# variable "security_name" { default = "Debian_securityMat_test_ev" }