Error!

Message:

freemarker.template.TemplateModelException: Method public int net.doubledoordev.backend.util.PortRange.getNextAvailablePort() throws net.doubledoordev.backend.util.PortRange$OutOfPortsException threw an exception when invoked on net.doubledoordev.backend.util.PortRange object "net.doubledoordev.backend.util.PortRange@37b8c66f" with arguments of types []. See cause exception.

The failing instruction (print stack trace for 1 more):
==> #assign serverport = Settings.portRan...  [in template "newserver.ftl" at line 37, column 21]