I just moved a site to a new server and everything is working beautifully except for Store. In CP, I see this PHP errors.
A PHP Error was encountered Severity: Notice Message: Constant STORE_CP already defined Filename: store/mcp.store.php Line Number: 9
The front-end has this error.
Fatal error: Call to undefined method Store_cart::count_contents() in /public_html/manager/expressionengine/third_party/store/mod.store.php on line 55
Store 1.6.3, EE 2.5.3