WRONG DATA. CHECK YOUR WOOCS OPTIONS!

WRONG DATA. CHECK YOUR WOOCS OPTIONS! appears once, right after installation, and it means the plugin has no usable currency configuration yet — not that something is broken.

Clearing it

• Open the plugin settings and press Save, even if you changed nothing. Saving writes the default currency set.
• Switch currency once on the front end.

The notice will not come back.

If it comes back anyway

Then the options really are unreadable, and there are three usual reasons.

The settings never saved. A 403 or a silent failure on save leaves the options empty — see error 403 when saving settings.

The base currency has no rate. Every currency needs a rate relative to the base one. A currency added by hand and left at zero produces exactly this warning.

A third-party filter is corrupting the currency array. Another plugin hooking woocs_currency_data_manipulation and returning something malformed will trigger it on every request. Switch to a default theme with only WooCommerce and FOX active to confirm.

For developers: the notice is emitted in index.php of the plugin, in the function woocommerce_currency_symbol, when the currency array does not contain the current currency.