Symptoms

When attempting to add an item to a list view and/or edit an item already present the following error was thrown:

Error Heading : SmartObject property ListName is a required property for selected method Create. Value must be set.

Details of an error : ?Type: System.NullReferenceException

?Source: SourceCode.SmartObjects.Client

?Method Base
?Member Type: Method

?Name: Validate

?Module
?Scope Name: SourceCode.SmartObjects.Client.dll

?Declaring Type
?Full Name: SourceCode.SmartObjects.Client.SmartObject

?Stack Trace:
at SourceCode.SmartObjects.Client.SmartObject.Validate(Boolean isList)

at SourceCode.SmartObjects.Client.SmartObjectClientServer.ExecuteScalar(SmartObject smartObject, DataTable inputTable)

at SourceCode.Forms.AppFramework.FormRuntime.SmartObjectExecution(BrokerSmartObject brokerSmo, SmartObjectBrokerMetaData brokerMetaData, Boolean outputDependencies, SmartObjectClientServer smoClientServer, Queue`1 soInstances)

at SourceCode.Forms.AppFramework.FormRuntime.WorkXmlToApi(BrokerPackageCollection packages, SmartObjectClientServer smoClientServer)

at SourceCode.Forms.AppFramework.FormRuntime.WorkXmlToApi(Stream input, Stream output)

at SourceCode.Forms.Runtime.AJAXCall.ProcessRequestInternal(HttpContext context)

 

Diagnoses

The root cause here was a ultimately an issue in the order of operations. Imagine two views A and B in this scenario view B was setting its parameters (which were used to execute the Create method) based upon values obtain from view A. The views A and B were initializing asynchronously and so because view A had yet to initialize view B could not obtain the needed parametrical values for itself.
 

Resolution

Switching the execution sequence from asynchronous to synchronous (one after the other) resolved this issue.