[exim] Can anyone spot the problem here?

Extract from paniclog:

2007-09-27 11:30:55 1Iapho-0000BN-T7 failed to expand condition "${if and { {def:h_X-Scan-Virus-Flag: } { match{True}{${lookup ldap {USER=${quote_ldapdn:cn = Directory Manager} PASS=${quote:aabbccdd} ldap:///o=$domain,o=mail?enableAntiVirus?sub?(mail=${quote_ldap:$local_part@$domain})}}}{1}{0} } } {yes}{no} }" for quarantine_virus router: missing } at end of condition inside "and" group

Confused since all brackets seem balanced/in their correct place to me. :S

Best,
-AL.