'File Not Found' Error in Gibbon V26 and Gibbon V27

URGENT = I too have all of a sudden have this FILE NOT FOUND. We have students sitting on Expected and can not make the Full and our census data for funding happens on Friday ( Australian Time) We are not able to make any adjustments or input any data after we hit submit it comes up with this error in all different actions within Gibbon.
I am the IT aide and this is beyond my ability to correct. PLEASE HELP ASAP our reception/ admin is now at a standstill.

This is having major inpact of our Legal Data collections.