How to display errror message in a form based on a procedure

I created a single-level form based on a procedure. In this form, I would like to generate an error message inside of a custom button, so I used the following inside of that button:
p_session.set_value (p_block_name => 'DEFAULT',
p_attribute_name => '_STATUS',
p_value => 'Please choose a valid chair from the popup icon.');
Unfortunately, it returned a WWV-0000 error code without any error messages. I use that code in another single-level form based on a table/view, and it works fine, but I need a single-level form based on a procedure. Therefore, I want to know if that code snippet can be used in a form based on a procedure or not? Do we have any other ways to display error messages in pl/sql besides p_session.set_value(...);
Thanks in advance.

Somebody please response.

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