"illegal (non-DNS-name) character in name" error when starting openswan

Issue

When starting an IPsec tunnel with Openswan, the following errors occur:

Apr  2 14:07:03 hostname ipsec__plutorun: 003 ERROR "/etc/ipsec.d/conn.secrets" line 1: index "10.10.1.1:PSK" syntax error in IPv6 numeric address
Apr  2 14:07:03 hostname ipsec__plutorun: 003 ERROR "/etc/ipsec.d/conn.secrets" line 1: index "msK!2*34f28+l" illegal (non-DNS-name) character in name
Apr  2 14:07:03 hostname ipsec__plutorun: 003 "/etc/ipsec.d/conn.secrets" line 1: unexpected end of id list