Upgrade to 7.0.2 (the "admin area ... directory that is not configured" error)

[polyglot2]

We are testing upgrading to 7.0.2 (using PHP 5.6, CGI mode) from (yes, old, we know) 5.3.14. The upgrade went smoothly, except that we are no longer able to get to the admin area. The error message is "Critical Error: You are attempting to access the admin area via a directory that is not configured. Please either revert to the default admin directory name, or see our documentation for Customising the Admin Directory." We don't use custom admin path previously.

 

So I tried adding '$customadminpath = "admin";' to configuration.php. Still the same error message. If I try using some non-existing directory, e.g. '$customadminpath = "foo";' then the error becomes "Critical Error: You are attempting to access the admin area via a directory that is different from the one configured. Please refer to the Customising the Admin Directory documentation for instructions on how to update it."

 

Any idea how to resolve this? I'm wondering what other check condition WHMCS is using to determine that the admin area directory is "configured". Any hints appreciated.

[polyglot2]

Oh, and the client area is also empty except for the "Logged in as Administrator" text at the upper right corner.

[othellotech]

So I tried adding '$customadminpath = "admin";'

Needs to be the full path and correctly owned by the user/group