Activiting Lightbox plugin knocked out my website

When I try to activate the Lightbox Plus ColorBox 2.6 plugin for weaver it brought up the following text:

PHP Warning: is_readable(): open_basedir restriction in effect. File(G:\PleskVhosts\olivierprestant.com\httpdocs/wp-content/plugins/https://olivierprestant.com/wp-content/plugins/lightbox-plus/languages/lightboxplus-en_US.mo) is not within the allowed path(s): (G:/PleskVhosts//olivierprestant.com\;C:\Windows\Temp\) in G:\PleskVhosts\olivierprestant.com\httpdocs\wp-includes\l10n.php on line 457

Now all of the pages on my site have been replaced with this text – https://olivierprestant.com/

Any help would be very much appreciated!!!