I got 6 of these errors, one second apart. I have never seen this before. Any ideas about what might be causing this?

Posting back to plugin web page NetCam_View: Exception has been thrown by the target of an invocation.-> Server stack trace: Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke (System.Runtime.Remoting.Proxies.RealProxy rp, System.Runtime.Remoting.Messaging.IMessage msg, System.Exception& exc, System.Object[]& out_args) [0x0014d] in <81342d83acda4c5590ec19c7afdf26b9>:0 at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_remoting_wrapper(intptr,i ntptr) at (wrapper remoting-invoke) HomeSeerAPI.IPlugInAPI.PostBackProc(string,string,string,int ) at Scheduler.proxyPage.postBackProc (Scheduler.StateObject& state, System.String Data) [0x00036] in :0

Here is my setup

Current Date/Time: 8/2/2019 8:27:59 AM
HomeSeer Version: HS3 Pro Edition 3.0.0.531
Linux version: Linux HomeSeer-Server 4.15.0-52-generic #56-Ubuntu SMP Tue Jun 4 22:49:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux System Uptime: 0 Days 6 Hours 14 Minutes 41 Seconds
IP Address: 127.0.0.1
Number of Devices: 482
Number of Events: 132
Available Threads: 799
HSTouch Enabled: True
Event Threads: 2
Event Trigger Eval Queue: 0
Event Trigger Priority Eval Queue: 0
Device Exec Queue: 0
HSTouch Event Queue: 0
Email Send Queue: 0

Enabled Plug-Ins
2.0.65.0: BLDSC
2.0.6.0: BLGarbage
2.0.43.0: BLLAN
3.0.27.0: BLLock
3.0.0.65: EasyTrigger
5.0.0.59: Global Cache Pro
3.0.0.14: NetCAM
3.2.0.8: SqueezeBox
3.0.1.18: weatherXML
3.0.1.252: Z-Wave