"Using include with formatted SQL requires a valid Liquibase Pro key", but worked for several days

General Discussion
1

I received the error shown in the subject line, but only after running successfully for several days as I developed my scripts. Is there a maximum number of changelog files that you can have before the error is given?

Sample changelog:

{
    "databaseChangeLog": [
        {
            "include": {
                "file": "db/schemas.sql",
                "relativeToChangelogFile": true
            }
        },
        {
            "include": {
                "file": "db/App_Guids.sql",
                "relativeToChangelogFile": true
            }
        }, ...
2

I found the cause of the error I was getting - I had a comment in one stored procedure that read like this

-- include retired employees in totals

the -- include was being interpreted by LB is an embedded script (!). Rewording the comment fixed the erro

-- retired employeed included in totals