License header check failure in build

11:46:26  + ./misc/license-header/license-header-check.bash
11:46:26  Checking license headers...
11:46:26  ./releng/org.eclipse.escet.releng.dev.documentation/images/rail/meta_terminals.props:0
11:46:26  ./releng/org.eclipse.escet.releng.dev.documentation/images/rail/meta_terminals.rr:0
11:46:26  2 issue(s) found...