Scripts Cannot Find Datasets

I'm trying to run a script that essentially does a find and replace for text in a specific variable for all data sets. However, no matter what I try, the script cannot find any datasets, even though I am able to import them, apply them, and export them as files. Any ideas? Below is my script (saved as replaceBulletScript.jsx in the same directory as my PSD):

#target photoshop

// Function to replace all occurrences of "•" with "•" in the "New-Card-Effect" variable across all datasets
function replaceBulletInAllDatasets(targetVariableName, targetString, replacementString) {
    try {
        // Get the active document
        var doc = app.activeDocument;

        // Ensure datasets exist
        if (!doc.dataSets || doc.dataSets.length === 0) {
            alert(
                "No datasets found in the active document: " + doc.name
            );
            return;
        }

        // Iterate through all datasets
        for (var i = 0; i < doc.dataSets.length; i++) {
            var dataSet = doc.dataSets[i];

            // Loop through the variables in the dataset
            for (var j = 0; j < dataSet.dataPoints.length; j++) {
                var dataPoint = dataSet.dataPoints[j];

                // Check if the variable name matches the target
                if (dataPoint.variable.name === targetVariableName) {
                    // Replace the target string in the data point's value
                    if (dataPoint.value.indexOf(targetString) !== -1) {
                        dataPoint.value = dataPoint.value.split(targetString).join(replacementString);
                    }
                }
            }
        }

        alert("Replacement complete for all datasets with variable name: " + targetVariableName);
    } catch (e) {
        alert("An error occurred: " + e.message);
    }
}

// Main execution
replaceBulletInAllDatasets("New-Card-Effect", "•", "•")