I have v1.6.4 of Expresso Store running on a site with EE v2.6.1
When trying to edit the channel with the product details I get the following PHP error:
Fatal error: Cannot redeclare class Store_config in /SERVERPATH/system/expressionengine/third_party/store/libraries/store_config.php on line 12
I also get the same error when trying to publish a channel entry. Any ideas on how to fix this?