How to trigger the "tailf:cli-custom-error text"

I define :c.yang ,as below:

//c.yang
module c {
namespace “http://www.testc.com”;
prefix testc;
import tailf-common {
prefix tailf;
}
leaf ctestc {
type string;
tailf:cli-disallow-value 123;
tailf:cli-custom-error “invalid ctestc”;
description “Description test”;
}
}

when i inpput command: superWC(config)# ctestc 123.
The defined of “tailf:cli-custom-error” does not output:

The label of “tailf:cli-custom-error text” description:

i have got it