After selecting the root node, i am faced with this error.

The root node has a vendr store picker datatype on it with a store selected.

Any ideas on where to start troubleshooting this?

Vendr 3.0 Vendr.Checkout 3.1 Umbraco 11.3.1

An error occurred
Value cannot be null. (Parameter 'dataType')

Exception Details
System.ArgumentNullException, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e: Value cannot be null. (Parameter 'dataType')
Stacktrace
at Vendr.Infrastructure.Resiliency.PollyExecutionStrategyBase.Execute[TResult](Func`1 operation, Func`1 verifySucceeded)
   at Vendr.Core.VendrUnitOfWorkProvider.Execute[T](Func`2 action)
   at Vendr.Common.Pipelines.Pipeline.Invoke[TPipeline,TEntity](TEntity entity, IDictionary`2 additionalData)
   at Vendr.Common.Pipelines.Pipeline.Invoke[TPipeline,TEntity](TEntity entity)
   at Vendr.Checkout.Services.InstallService.Install(Int32 siteRootNodeId, StoreReadOnly store)
   at Vendr.Checkout.Web.Controllers.VendrCheckoutApiController.InstallVendrCheckout(GuidUdi siteRootNodeId)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|26_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)