[Serusers] Strange error when using group module

[Mike Fallows]

Anyone help me with this one.

I am trying to group users so that some are allowed place SIP->SIP calls via
the proxy, and others are also allowed to access the PSTN.

An extract of the ser.cfg is below:

if (!is_user_in("credentials","int")) {
     sl_send_reply("403", " no permission for external calls");
     break;
     }

When this is called, I receive this in /var/log/messages:

Mar  2 22:04:41 ns-nby-ser1 /usr/local/sbin/ser[6988]: is_user_in(): No
authorized credentials found (error in scripts)

And the user fails to connect.

Any ideas would be greatly appreciated.

Mike