machine-0: 20:23:18 CRITICAL juju.rpc panic running request {MethodCaller:0xc006925bc0 transformErrors:0x26eb950 hdr:{RequestId:1341 Request:{Type:CAASOperatorUpgrader Version:1 Id: Action:UpgradeOperator} Error: ErrorCode: ErrorInfo:map[] Version:1}} with arg {AgentTag:application-katib-controller Version:2.8.7.1}: runtime error: index out of range [0] with length 0
goroutine 477042 [running]:
runtime/debug.Stack(0xc00715ed78, 0x44848c0, 0xc001a77340)
/snap/go/current/src/runtime/debug/stack.go:24 +0x9d
github.com/juju/juju/rpc.(*Conn).runRequest.func1(0xc00715ff28, 0x419dda0, 0xc006925c40, 0x199, 0xc006f3cf00, 0x5199f20, 0xc002fff200)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/rpc/server.go:558 +0xe2
panic(0x44848c0, 0xc001a77340)
/snap/go/current/src/runtime/panic.go:969 +0x166
github.com/juju/juju/caas/kubernetes/provider.operatorInitUpgrade.func1.1(0xc00715f6f8, 0xc00715f5e0, 0x2)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/caas/kubernetes/provider/operator_upgrade.go:105 +0x67d
github.com/juju/juju/caas/kubernetes/provider.operatorUpgrade(0xc00d6c842c, 0x10, 0x2, 0x8, 0x0, 0x0, 0x7, 0x1, 0x52215e0, 0xc00d64c9f0, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/caas/kubernetes/provider/operator_upgrade.go:198 +0x3fc
github.com/juju/juju/caas/kubernetes/provider.(*kubernetesClient).upgradeOperator(0xc007adbc80, 0x51e5fe0, 0xc00ac8b330, 0x2, 0x8, 0x0, 0x0, 0x7, 0x1, 0xc000227980, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/caas/kubernetes/provider/operator_upgrade.go:223 +0x21d
github.com/juju/juju/caas/kubernetes/provider.(*kubernetesClient).Upgrade(0xc007adbc80, 0xc00d6c8420, 0x1c, 0x2, 0x8, 0x0, 0x0, 0x7, 0x1, 0xc002f9c1e0, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/caas/kubernetes/provider/upgrade.go:32 +0x4ab
github.com/juju/juju/apiserver/facades/controller/caasoperatorupgrader.(*API).UpgradeOperator(0xc00792b700, 0xc00d6c8420, 0x1c, 0x2, 0x8, 0x0, 0x0, 0x7, 0x1, 0x0, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/apiserver/facades/controller/caasoperatorupgrader/upgrader.go:70 +0x167
reflect.Value.call(0x3eb9e20, 0xc00792b700, 0x213, 0x488b422, 0x4, 0xc002fff2a0, 0x1, 0x1, 0x1, 0xc002fff2a0, ...)
/snap/go/current/src/reflect/value.go:460 +0x8ab
reflect.Value.Call(0x3eb9e20, 0xc00792b700, 0x213, 0xc002fff2a0, 0x1, 0x1, 0x1, 0x1, 0xc005f5f000)
/snap/go/current/src/reflect/value.go:321 +0xb4
github.com/juju/rpcreflect.newMethod.func8(0x51fb4e0, 0xc006925cc0, 0x3eb9e20, 0xc00792b700, 0x16, 0x419dda0, 0xc006925c40, 0x199, 0x4122480, 0xc00ac8b300, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/vendor/github.com/juju/rpcreflect/type.go:344 +0x109
github.com/juju/juju/apiserver.(*srvCaller).Call(0xc006925bc0, 0x51fb4e0, 0xc006925cc0, 0x0, 0x0, 0x419dda0, 0xc006925c40, 0x199, 0x0, 0x0, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/apiserver/root.go:171 +0xd6
github.com/juju/juju/rpc.(*Conn).runRequest(0xc006f3cf00, 0x51d31a0, 0xc006925bc0, 0x4a43720, 0x53d, 0xc00d6c8400, 0x14, 0x1, 0x0, 0x0, ...)
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/rpc/server.go:571 +0x196
created by github.com/juju/juju/rpc.(*Conn).handleRequest
/home/kelvinliu/Code/Golang/src/github.com/juju/juju/rpc/server.go:475 +0x756
