I've SharePoint 2016 on premises and i wanted to copy items across sites, so i chose plumsail wsp, as per the instructions i have downloaded the wsp , deployed it in Central admin, activated it in the web application level. All went fine so far and when i activate it as site feature i got the following error and i need to fix this, please help me.
Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.] Microsoft.SharePoint.WorkflowServices.WorkflowServicesContext.get_TenantAddress() +13 Microsoft.SharePoint.WorkflowServices.SPWebWorkflowSecurityContext.CreateOrUpdateServiceGroup(SPWeb lookupWeb, SPAppPrincipal app) +2600 Microsoft.SharePoint.WorkflowServices.SPWebWorkflowSecurityContext.<SetupApplicationEcosystem>b__3() +982 Microsoft.SharePoint.Utilities.SecurityContext.RunAsProcess(CodeToRunElevated secureCode) +197 Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(WaitCallback secureCode, Object param) +537 Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(CodeToRunElevated secureCode) +95 Microsoft.SharePoint.WorkflowServices.SPWebWorkflowSecurityContext.SetupApplicationEcosystem() +213 Microsoft.SharePoint.WorkflowServices.SPCustomActionPackagingFeatureReceiver.GetContext(SPWeb web) +182 Microsoft.SharePoint.WorkflowServices.SPCustomActionPackagingFeatureReceiver.FeatureActivated(SPFeatureReceiverProperties properties) +487 Microsoft.SharePoint.SPFeature.DoActivationCallout(Boolean fActivate, Boolean fForce) +1601 Microsoft.SharePoint.SPFeature.Activate(SPSite siteParent, SPWeb webParent, SPFeaturePropertyCollection props, SPFeatureActivateFlags activateFlags, Boolean fForce) +2791 Microsoft.SharePoint.SPFeatureCollection.AddInternal(SPFeatureDefinition featdef, Version version, SPFeaturePropertyCollection properties, SPFeatureActivateFlags activateFlags, Boolean force, Boolean fMarkOnly) +3301 Microsoft.SharePoint.SPFeatureCollection.AddInternalWithName(Guid featureId, Int32 compatibilityLevel, String featureName, Version version, SPFeaturePropertyCollection properties, SPFeatureActivateFlags activateFlags, Boolean force, Boolean fMarkOnly, Boolean fIgnoreMissing, SPFeatureDefinitionScope featdefScope) +165 Microsoft.SharePoint.WebControls.FeatureActivator.ActivateFeature(Guid featid, Int32 compatibilityLevel, SPFeatureDefinitionScope featdefScope) +841 Microsoft.SharePoint.WebControls.FeatureActivatorItem.ToggleFeatureActivation() +150 Microsoft.SharePoint.WebControls.FeatureActivatorItem.BtnActivateFeature_Click(Object objSender, EventArgs evtargs) +117 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +11595936 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +274 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1890
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4330.0