Missing files and issues with LibreNMS

I came in this morning and noticed our LibreNMS would not load. I ran ./validate.php and recieved this output:

librenms@librenms:/opt/librenms$ sudo ./validate.php
PHP Warning: require(/opt/librenms/vendor/composer/…/symfony/polyfill-mbstring /bootstrap.php): failed to open stream: No such file or directory in /opt/libren ms/vendor/composer/autoload_real.php on line 66
PHP Fatal error: require(): Failed opening required ‘/opt/librenms/vendor/compo ser/…/symfony/polyfill-mbstring/bootstrap.php’ (include_path=’.:/usr/share/php’ ) in /opt/librenms/vendor/composer/autoload_real.php on line 66

Component Version
LibreNMS 1.42.01-27-g45d35ef
DB Schema ?
PHP 7.0.30-0ubuntu0.16.04.1
MySQL ?
RRDTool 1.5.5
SNMP NET-SNMP 5.7.3

====================================

Warning: require(/opt/librenms/vendor/composer/…/symfony/polyfill-mbstring/boot strap.php): failed to open stream: No such file or directory in /opt/librenms/ve ndor/composer/autoload_real.php on line 66

Fatal error: require(): Failed opening required ‘/opt/librenms/vendor/composer/. ./symfony/polyfill-mbstring/bootstrap.php’ (include_path=’.:/usr/share/php’) in /opt/librenms/vendor/composer/autoload_real.php on line 66

I looked in the symfony directory, and did indeed notice that /polyfill-mbstring/bootstrap.php is not there. Currently in the directory is this:

librenms@librenms:/opt/librenms/vendor/symfony$ ls
console debug event-dispatcher http-foundation polyfill-ctype process translation yaml
css-selector dotenv finder http-kernel polyfill-php70 routing var-dumper

Can anyone help me with how to recover /polyfill-mbstring/bootstrap.php directory and files?

Thanks!

I was able to correct this issue by running ./scripts/composer_wrapper.php install --no-dev

Thanks!