Hello,
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1) Do you have the mentioned issue with the Storefront theme? Please, check if you have this error when the Storefront theme is activated.
2) Try to disable all the third-party plugins (including cache plugins), that do not come bundled with XStore https://www.8theme.com/documentation/xstore/plugins/included-plugins/ , clear cache of browser, and check how it works then.
Let us know the results.
Regards















