Errors:
Details : $E 0001 Unable to access index \\servername\ProNetIndexes$\Main\CVs
Operation failed: open (could not open directory) path=\\servername\ProNetIndexes$\Main\CVs (error = The system cannot contact a domain controller to service the authentication request. Please try again later. (1265))
or
Details : $E 0001 Unable to access index \\servername\ProNetIndexes$\Main Sector\CVs
Operation failed: open (could not open directory) path=\\servername\ProNetIndexes$\Main Sector\CVs (error = The network path was not found. (53))
The error you are getting indicates that you do not have access to the Index File on the path specified in the error message
You can check this by copying the above path into a file explorer address bar.
You would need to contact your IT support to sort out your access to the path where the indexes reside.