# ask-questions


12/26/2021, 10:07 AM
Hi, I have difficulties to setup the first experiment with visual editor Background: I use Matomo Analytics as a Wordpress plugin, so the data source is MySQL. The Metrics has been set up already, it displays the results. I created an Experiment table with the suggested fields within the MySQL DB. But the Experiment script does not work. Should I write an extra module to put the data into this table?
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track: function (experimentId, variationId) {
      analytics.track("Experiment Viewed", {


12/26/2021, 12:39 PM
The default "analytics.track" code snippet is assuming you use Matomo has its own way of tracking events so that code will need to change
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_paq.push(['trackEvent', 'Experiment', experimentId, variationId]);
Something like that should work (I don't have Matomo to test so this is just based on their documentation)
If you do that, you shouldn't need to create a new MySQL table at all for experiment impressions. You can use the existing Matomo events table instead.


12/26/2021, 4:39 PM
Thanks, Matomo does not have a default experiment table, so I had to create one. I created a WP-Plugin, where I can put the script on the page. Still, I have the message "Missing Required Script". The save_experiment calls a PHP function via Jquery/Ajax. I tested it, the callback function "track" will never be called. When should it be called? Every time when the page is loaded, right?
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            window.GROWTHBOOK_CONFIG = {
                track: function (experimentId, variationId) {
                    save_experiment(experimentId, variationId);
        <script async src="<>"></script>
I think I have the problem, I have the "Missing Required Script" when Growthbook tries to open the original page. Probably the jquery has been defined twice.
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Uncaught SyntaxError: Identifier '$' has already been declared
at ab-designer.cjs.production.min.js:1