Cannot Remote Target

anyone know how to fix this i have a target that had to be rebuilt because it died but cannot remove this from the controller “Failed to remove target”

Also have this issue. Same steps, had to reinstall a target and now there is two on the ads controller.

This is in the console log after trying to remove:

Returned exception from API call ADSModule/DetatchTarget
[0] (NullReferenceException) : Object reference not set to an instance of an object
at ADSModule.RemoteADSController.Remove (Guid InstanceId) at ADSModule.WebMethods.DetatchTarget (Guid Id) at GSMyAdmin.WebServer.WebAttributes.InvokeMethod (String MethodName, Newtonsoft.Json.Linq.JObject Data, m.Http.IHttpRequest request, ModuleShared.IWebSession Session, ModuleShared.WebMethodsBase MethodsClass, String RawRequest) at GSMyAdmin.WebServer.APIService.InvokeAPI (m.Http.IHttpRequest request, ModuleShared.IWebSession Session, Newtonsoft.Json.Linq.JObject Data, String RequestModule, String RequestMethod, String RawRequest)