Warning: require(/usr/share/php/wp-stack-cache.php) (3 replies)

Hi
I have WAMP installed fine and have some sites up and running locally. However I have come across a problem with the latest. I'm getting the following error messages

Can anyone help??

( ! ) Warning: require(/usr/share/php/wp-stack-cache.php): failed to open stream: No such file or directory in C:\wamp64\www\welshcountry3\wp-content\mu-plugins\wp-stack-cache.php on line 21
Call Stack
# Time Memory Function Location
1 0.0003 403944 {main}( ) ...\index.php:0
2 0.0004 404232 require( 'C:\wamp64\www\welshcountry3\wp-blog-header.php' ) ...\index.php:17
3 0.0005 404584 require_once( 'C:\wamp64\www\welshcountry3\wp-load.php' ) ...\wp-blog-header.php:13
4 0.0011 406056 require_once( 'C:\wamp64\www\welshcountry3\wp-config.php' ) ...\wp-load.php:37
5 0.0012 407616 require_once( 'C:\wamp64\www\welshcountry3\wp-settings.php' ) ...\wp-config.php:99
6 0.0454 4068344 include_once( 'C:\wamp64\www\welshcountry3\wp-content\mu-plugins\wp-stack-cache.php' ) ...\wp-settings.php:291

( ! ) Fatal error: require(): Failed opening required '/usr/share/php/wp-stack-cache.php' (include_path='.;C:\php\pear') in C:\wamp64\www\welshcountry3\wp-content\mu-plugins\wp-stack-cache.php on line 21
Call Stack
# Time Memory Function Location
1 0.0003 403944 {main}( ) ...\index.php:0
2 0.0004 404232 require( 'C:\wamp64\www\welshcountry3\wp-blog-header.php' ) ...\index.php:17
3 0.0005 404584 require_once( 'C:\wamp64\www\welshcountry3\wp-load.php' ) ...\wp-blog-header.php:13
4 0.0011 406056 require_once( 'C:\wamp64\www\welshcountry3\wp-config.php' ) ...\wp-load.php:37
5 0.0012 407616 require_once( 'C:\wamp64\www\welshcountry3\wp-settings.php' ) ...\wp-config.php:99
6 0.0454 4068344 include_once( 'C:\wamp64\www\welshcountry3\wp-content\mu-plugins\wp-stack-cache.php' ) ...\wp-settings.php:291