panic

    2018/04/26 20:02:14.447545 [DEBUG] client.fingerprint_manager: detected drivers [qemu rkt mock_driver docker exec raw_exec java]
    2018/04/26 20:02:14.447762 [INFO] client: Node ID "6a37a793-2dd6-d849-c20a-77da1b9ad278"             
    2018/04/26 20:02:14.449133 [INFO] client: node registration complete                                 
    2018/04/26 20:02:14.449171 [ERR] client.consul: error discovering nomad servers: client.consul: unable to query Consul datacenters: Get http://127.0.0.1:8500/v1/catalog/datacenters: dial tcp 127.0.0.1:8500: getsockopt: connection refused
    2018/04/26 20:02:14.449233 [DEBUG] client: updated allocations at index 1 (total 0) (pulled 0) (filtered 0)
    2018/04/26 20:02:14.449796 [DEBUG] client: state updated to ready                                    
    2018/04/26 20:02:14.449831 [DEBUG] client: allocs: (added 0) (removed 0) (updated 0) (ignore 0)      
    2018/04/26 20:02:15.449610 [DEBUG] client: state changed, updating node and re-registering.          
    2018/04/26 20:02:15.455109 [INFO] client: node registration complete                                 
panic: runtime error: index out of range            

goroutine 39 [running]:   
github.com/hashicorp/nomad/vendor/github.com/gorhill/cronexpr.(*Expression).nextDayOfMonth(0xc42037ea80, 0x1347aec8, 0xed274275a, 0x0, 0x0, 0x15, 0x5)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/gorhill/cronexpr/cronexpr_next.go:115 +0x254
github.com/hashicorp/nomad/vendor/github.com/gorhill/cronexpr.(*Expression).Next(0xc42037ea80, 0x1347aec8, 0xed274275a, 0x0, 0x0, 0x395, 0x13b4da57)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/gorhill/cronexpr/cronexpr.go:210 +0x699
github.com/hashicorp/nomad/nomad/structs.(*PeriodicConfig).Next(0xc420074730, 0x1347aec8, 0xed274275a, 0x0, 0x1347aec8, 0xed274275a, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/structs/structs.go:2660 +0x3a8                  
github.com/hashicorp/nomad/nomad.(*PeriodicDispatch).Add(0xc42035f2c0, 0xc420070820, 0x0, 0x0)           
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/periodic.go:224 +0x2c8                          
github.com/hashicorp/nomad/nomad.(*nomadFSM).applyUpsertJob(0xc420487a40, 0xc42073c001, 0x489, 0x49c, 0x9, 0x0, 0x0)
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/fsm.go:426 +0x2d2                               
github.com/hashicorp/nomad/nomad.(*nomadFSM).Apply(0xc420487a40, 0xc420647e20, 0x1f5e0c0, 0x3)           
        /opt/gopath/src/github.com/hashicorp/nomad/nomad/fsm.go:198 +0x3c4                               
github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.(*Raft).runFSM.func1(0xc42074abf0)           
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft/fsm.go:57 +0x17b     
github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.(*Raft).runFSM(0xc420402dc0)                 
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft/fsm.go:120 +0x31e    
github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.(*Raft).(github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.runFSM)-fm()
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft/api.go:506 +0x2a     
github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.(*raftState).goFunc.func1(0xc420402dc0, 0xc4202a0ef0)
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft/state.go:146 +0x53   
created by github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft.(*raftState).goFunc               
        /opt/gopath/src/github.com/hashicorp/nomad/vendor/github.com/hashicorp/raft/state.go:144 +0x66