Problem in wordpress configuration

My server has sent me a list of repeated error messages to explain why my website is so erratic in its appearances. Could this be because I have two websites in the same package? One is , and the other, works fine.

The constant errors are:Warning: fopen(C:\Inetpub\vhosts\ezikocareersinfo.org\httpdocs\wordpress_f\/wp-config.php): failed to open stream: No such file or directory in C:\Program Files (x86)\Parallels\Plesk\var\apscache{data-eb0ca9a9-5ac0-11e5-80e1-005056010925}\scripts\file-util.php on line 10or line17

I have a little experience but this has not happened before – and it is a crucial period for me.