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IPAM Scans Not Running

Our IPAM scans have been hung. I tried flushing the Collector and JobEngine by stopping services and copying in the blank for each. I have also cleared the SNMPCred table for IPAM. It still isn't working. I just found this in the Collector.Service.log. Does anyone know what this means?

2019-01-29 11:28:25,068 [26] ERROR SolarWinds.Collector.PollingController.PollingController - Resolve polling plan failed!! We will try to resolve it in next round

System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.

at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)

at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)

at SolarWinds.IPAM.Storage.DAL.DhcpServerDAL.Get(String SqlPostfix)

at SolarWinds.IPAM.Storage.DAL.DhcpScopeDAL.FindParentDhcpServer(Int32 NodeId)

at SolarWinds.IPAM.Collector.DhcpScopesPollingPlan.UpdatePolling(IUpdatePollingContext context)

at SolarWinds.Collector.PollingController.PollingController.ResolvePollingPlanReal(PendingItem pendingItem)

at SolarWinds.Collector.PollingController.PollingController.ResolvePendingItemsThread(Object state)

Its now showing:

019-01-29 11:44:22,339 [7] ERROR SolarWinds.Collector.PollingController.PollingController - Resolve polling plan failed!! We will try to resolve it in next round

System.InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is closed.