ReferenceError: Can't find variable

Automation OmniOutliner Automation
#1

I’ve ran some code in the console and I’m trying to adapt it to a .omnijs Solitary Action. Here’s what I have currently:

/*{
    "type": "action",
    "targets": ["omnioutliner"],
    "author": "adiabatic",
    "description": "Colors predictions.",
    "label": "Color Predictions",
    "paletteLabel": "Color Predictions"
}*/


var _ = function() {
    const o = document.outline;
    const greenStyle = o.namedStyles.byName('Highlight: Green');
    const redStyle = o.namedStyles.byName('Highlight: Red');
    
    const happenedColumn = o.columns.byTitle('Happened?');

    function colorize() {
        for (const item of o.rootItem.leaves) {
            item.style.clear();
            if (item.valueForColumn(happenedColumn).name === 'yes') {
                item.style.setStyle(greenStyle);
            } else if (item.valueForColumn(happenedColumn).name === 'no') {
                item.style.setStyle(redStyle);
            }
        }
    }
    
    function clearHappenedColumn() {
        for (const item of o.rootItem.leaves) {
            item.style.clear(); // line 31
            const h = item.valueForColumn(happenedColumn)
            if (h) h.remove();
        }
        colorize();
    }

    var action = new Plugin.Action(function(selection, sender) {
        colorize();
    });

    action.validate = function(selection, sender) {
        return true;
    };

    return action;
}();
_;

I put the file in ~/Library/Containers/com.omnigroup.OmniOutliner5/Data/Library/Application Support/PlugIns/ and went to the Automation menu in OmniOutliner. “Color Predictions” was grayed out, so I opened up the console to see what could’ve been wrong. I saw this:

    at /Users/comatoast/Library/Containers/com.omnigroup.OmniOutliner5/Data/Library/Application Support/PlugIns/color-predictions.omnijs:31
ReferenceError: Can't find variable: Plugin /Users/comatoast/Library/Containers/com.omnigroup.OmniOutliner5/Data/Library/Application Support/PlugIns/color-predictions.omnijs:31

…repeated for a total of nine times. Line 31 is the call to item.style.clear() in clearHappenedColumn(). It’s explicitly marked as such with a comment.

I have no idea why I’m getting this error and I don’t know what it means, as I’m not referring to anything I think of as a “Plugin” on that line. Can anyone give me an idea of what I’m doing wrong?

#2

If we assume that the the line numbering doesn’t include the 8 commented lines at the top, then line 31 begins with:

    var action = new Plugin.Action(function(selection, sender) {
        colorize();
    });

Perhaps a note to software support ?