We are getting the error once we submit the sitecore 9.1 form. This is happening when we enable the the check box "Is tracking Enable" in sitecore core form. and this error is not with Standalone role, only with CD and CM server. The error is

[ArgumentException: alias should not be null or an empty string. Parameter name: alias] Sitecore.Framework.Conditions.RequiresValidator1.ThrowExceptionCore(String condition, String additionalMessage, ConstraintViolationType type) +100 Sitecore.Framework.Conditions.Throw.ValueShouldNotBeNullOrAnEmptyString(ConditionValidator1 validator, String conditionDescription) +121 Sitecore.Framework.Conditions.ValidatorExtensions.IsNotNullOrEmpty(ConditionValidator1 validator) +41 Sitecore.Marketing.Core.Extensions.ConditionValidatorExtensions.IsValidAlias(ConditionValidator1 validator) +139 Sitecore.Marketing.Definitions.DefinitionManagerBase2.GetByAlias(String alias, CultureInfo cultureInfo, Boolean includeInactiveVersion) +87 Sitecore.Analytics.Data.DefinitionCollection1.get_Item(String name) +156 Sitecore.Analytics.Tracking.PageContext.Register(PageEventData pageData) +437 Sitecore.ExperienceForms.Analytics.Tracking.FormEventsTracker.RegisterFormBegin(FormTrackingEventData pageEventData) +374 Sitecore.ExperienceForms.Analytics.Tracking.FormEventsTracker.RegisterEvent(TEventData trackingEventData) +100 Sitecore.ExperienceForms.Mvc.FormRenderingContext.RegisterFormEvent(FormEventData formEventData) +117 Sitecore.ExperienceForms.Mvc.Controllers.FormBuilderController.Index(FormDataModel data) +271 lambda_method(Closure , ControllerBase , Object[] ) +139 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2 parameters) +35 System.Web.Mvc.Async.<>c.<BeginInvokeSynchronousActionMethod>b__9_0(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +39 System.Web.Mvc.Async.WrappedAsyncResult2.CallEndDelegate(IAsyncResult asyncResult) +70 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +42 System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__11_0() +72 System.Web.Mvc.Async.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2() +387 System.Web.Mvc.Async.<>c__DisplayClass11_1.<InvokeActionMethodFilterAsynchronouslyRecursive>b__2() +387 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +42 System.Web.Mvc.Async.<>c__DisplayClass3_6.<BeginInvokeAction>b__3() +50 System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult) +188 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38 System.Web.Mvc.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +26 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +68 System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52 System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +39 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38 System.Web.Mvc.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +40 System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +648 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +213 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +131