Warning: require(./source/class/class_core.php): failed to open stream: No such file or directory in C:\wwwroot\127.0.0.1\plugin.php on line 14

Fatal error: require(): Failed opening required './source/class/class_core.php' (include_path='.;C:\php\pear') in C:\wwwroot\127.0.0.1\plugin.php on line 14