The header is missing
Every pattern needs a small header at the top, wrapped in lines of three dashes. This file forgets it.
The pattern
# A phase
There is no front matter. v1 requires a `---` block at the very top of the file.
What Weave sees
Weave can't read this file. Here is the message it shows so you know what to fix.
{
"code": "missing-frontmatter",
"message": "Front matter delimited by `---` is required at the start of the file."
}