Sinkholes are not available

I played a game and suddenly some of sinkholes became blocked by roots. I dont know how to fix it.

I found an error in logs
[00:00:25]: [Shard] Connection to master failed. Waiting to reconnect...
[00:00:26]: Validating portal[2] <-> 1[2] (inactive)    
[00:00:26]: Validating portal[oceanwhirlbigportal] <-> 1[oceanwhirlbigportal] (inactive)    
[00:00:26]: Validating portal[5] <-> 1[5] (inactive)    
[00:00:26]: Validating portal[3] <-> 1[3] (inactive)    
[00:00:26]: Validating portal[4] <-> 1[4] (inactive)    
[00:00:26]: Validating portal[9] <-> 1[9] (inactive)    
[00:00:26]: Validating portal[10] <-> 1[10] (inactive)    
[00:00:26]: Validating portal[7] <-> 1[7] (inactive)    
[00:00:26]: Validating portal[8] <-> 1[8] (inactive)    
[00:00:26]: Validating portal[1] <-> 1[1] (inactive)    
[00:00:26]: Validating portal[6] <-> 1[6] (inactive)    
[00:00:30]: About to start a shard with these settings:
[00:00:30]:   ShardName: Caves
[00:00:30]:   ShardID: 2477870927
[00:00:30]:   ShardRole: SECONDARY
[00:00:30]:   MasterHost: 127.0.0.1
[00:00:30]:   MasterBind: (null)
[00:00:30]:   MasterPort: 10888
[00:00:30]: [Shard] Connecting to master...
[00:00:30]: [Shard] Sending secondary shard information to master...