1. Destination of migration could not be found!------ This is just a warning which does not seem to cause the issue. Also I can see hazelcaste exception please correct it if required and do a node by node restart with clear cache of temp folder.
2. For second issue If the auto-discovery is enabled then you have to truncate these table pegadata.pr_sys_statusnodes,
if auto-discovery is not enabled then add host IP manually in jmx configuration