I faced the same problem recently and changing the visualization's name inside of my app did the trick. All you have to do is change the name to "horizon_chart_viz", or any other name, as long as it is different from the original visualization's name:
Change the visualization stanza inside the "visualizations.conf" file to "[horizon_chart_viz]"
Change the visualizations stanza on the "default.meta" file to "[visualizations/horizon_chart_viz]"
Change the name of the folder containing the visualization to "horizon_chart_viz" (on /etc/apps//appserver/static/visualizations/)
And you're good to go 🙂
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