oc adm groups sync fails with 'bindPassword.file: Invalid value: "ldap_sync.yaml/bindPassword.encrypted'

Issue

group synchronization is failing with this error:

error: validation of LDAP sync config failed: [bindPassword.file: Invalid value: "ldap_sync.yaml/bindPassword.encrypted": could not read file: stat ldap_sync.yaml/bindPassword.encrypted: not a directory, bindPassword.keyFile: Invalid value: "ldap_sync.yaml/bindPassword.key": could not read file: stat ldap_sync.yaml/bindPassword.key: not a directory, bindDN: Invalid value: "uid=gparente,ou=users,dc=example,dc=com": bindDN and bindPassword must both be specified, or both be empty, bindPassword: Invalid value: "(masked)": bindDN and bindPassword must both be specified, or both be empty]