Articulate 360 - ERROR Keeps on crashing - Need help please

Hi,

Articulate 360 keeps on crashing and I keep on getting the error message below:

<?xml version="1.0" encoding="utf-16"?>
<ErrorReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<UserId>aid|92ad9ce1-0250-4db0-8647-bef3283bce0a</UserId>
<HardwareId>WJ10H-KQ01S-G0U4U-UVT3D</HardwareId>
<Message>StartIndex cannot be less than zero.
Parameter name: startIndex</Message>
<StackTrace> at StringBuilder System.Text.StringBuilder.Remove(int startIndex, int length)
at string Articulate.Collections.CollectionItem.GetRelativeKey(ICollectionItem oTarget, object context)
at string Articulate.Design.Triggers.TriggerPublish.GetRelativeKey(bwObject bwObject, ITriggerBase trigger, object context, ICollectionItem targetshape)
at void Articulate.Design.Triggers.TriggerPublish.CreateShapeStateChangeActions(IPlayerService service, IActionList actions, bwObject bwObject, ITriggerBase trigger, object context)
at void Articulate.Design.Triggers.TriggerPublish.PublishActions(IActionList actions, IPlayerService service, bwObject _bwObject, ITriggerBase trigger, object context, string targetWindow, bool reverse, bool forceActionGroup, string actionGroupName, object variablesStorageContext)
at void Articulate.Design.Triggers.TriggerPublish.AddEvent(bwEvent bwevent, IPlayerService service, bwObject _bwObject, ITriggerBase trigger, object context, string targetWindow, bool forceActionGroup, string actionGroupName)
at void Articulate.Design.Triggers.TriggerPublish.PublishTriggers(IPlayerService service, List&lt;bwEvent&gt; eventslist, bwObject _bwObject, IReadOnlyList&lt;ITriggerBase&gt; list, object context, object variablesStorageContext)
at void Articulate.Design.Triggers.TriggerCollection.Publish(IPlayerService service, List&lt;bwEvent&gt; eventslist, bwObject obj, object context, List&lt;ITriggerBase&gt; customtriggers, object variablesStorageContext)
at void Articulate.Design.Shape.PublishTriggers(IPlayerService service, bwStageObject stageObj, bwSlideBase slide)
at bwStageObject Articulate.Design.Shape.GetStageObject(IPlayerService service, bwSlideBase slide)
at bwStageObject Articulate.Design.Shape.Articulate.Player.IPlayerShape.GetStageObject(IPlayerService service, bwSlideBase slide)
at void Articulate.Player.PlayerContentPublisher.WriteShapes(IEnumerable&lt;IPlayerShape&gt; shapes, bwSlideBase slideobj)
at void Articulate.Player.PlayerContentPublisher.WriteSlideLayers(IPlayerSlide slide, bwSlide slideobj)
at bwSlide Articulate.Player.PlayerContentPublisher.CreateSlideObject(IPlayerSlide slide, bwISlideContainer sceneobj)
at void Articulate.Player.PlayerContentPublisher.CreateBridgewaterSlide(PlayerWriterSettings settings, IPlayerSlide slide, bwISlideContainer sceneobj)
at bool Articulate.Player.PlayerContentPublisher.CreateContentScenes(PlayerWriterSettings settings, IPlayerContentProvider contentProvider)
at bwContent Articulate.Player.PlayerWriter.WriteContent(IPlayerContentProvider contentProvider)
at bool Articulate.Player.PlayerWriter.Write(IPlayerContentProvider contentProvider)
at void Articulate.Design.Publish.PublishWorker.PerformPublish()
at void Articulate.Design.Publish.TargetContext+PublishBackgroundWorker.OnDoWork(DoWorkEventArgs e)
at void Articulate.ComponentModel.STABackgroundWorker.WorkerThreadStart(object argument)</StackTrace>
</ErrorReport>

Please could someone have  a look at the error message as get back to me as to why this is occuring.

Thank you