Using WordPress on GoDaddy's IIS and installing CMB2 results in the following error:

PHP Warning: is_readable(): open_basedir restriction in effect. File(/languages/en_US.mo) is not within the allowed path(s): (G:/PleskVhosts//give.advancedwp.org\;C:\Windows\Temp\) in G:\PleskVhosts\give.advancedwp.org\httpdocs\wordpress\wp-includes\l10n.php on line 476

Which basically means that the server configuration has a setting for permitted file paths, and that this plugin does not match the required pattern... hence the error.

I've narrowed it down to the l10ni18n method: https://github.com/WebDevStudios/CMB2/blob/master/init.php#L157

I'm looking into a fix right now that'll make IIS happy and preserve the method's functionality.