I Don't think there is anything we can do. The Cpanel installation or the template is corrupted and needs to be fixed or reinstalled by an admin.
Further information - after clicking Cpanel button the error message seen is:
"A fatal error or timeout occurred while processing this directive."
After logging in, on clicking the Open Cpanel button, I just get an error message which when expanded reveals the text below. Looks like...
Separate names with a comma.