Minecraft server crashing

My minecraft server doesn't tick for 60 seconds then crashes when i start debug profiling it says this 

[12:28:45] [Server thread/INFO]: Started debug profiling
[12:28:49] [Server thread/WARN]: Something's taking too long! 'root.nextTickWait' took aprox 106.8542 ms
[12:28:49] [Server thread/WARN]: Something's taking too long! 'root' took aprox 128.3488 ms
[12:28:49] [Server thread/WARN]: Something's taking too long! 'root.nextTickWait' took aprox 105.5005 ms
[12:28:49] [Server thread/WARN]: Something's taking too long! 'root' took aprox 129.3881 ms