Error thrown

Failed opening required '/customers/b/b/7/plindblom.se/httpd.www/wp-content/plugins/backwpup/vendor/composer/../amphp/amp/lib/functions.php' (include_path='/customers/b/b/7/plindblom.se/httpd.www/wp-content/plugins/backwpup/vendor/pear/pear_exception:/customers/b/b/7/plindblom.se/httpd.www/wp-content/plugins/backwpup/vendor/pear/console_getopt:/customers/b/b/7/plindblom.se/httpd.www/wp-content/plugins/backwpup/vendor/pear/pear-core-minimal/src:/customers/b/b/7/plindblom.se/httpd.www/wp-content/plugins/backwpup/vendor/pear/archive_tar:.:/usr/share/php')