workflows can no longer be published once the Nintex Forms for Nintex Workflow feature is enabled

Hi,

I vae trial versions of Nintex Workflow 2013 v3.0.5.0 and Nintex Forms 2013 v2.2.1.0 .

I noticed that whenever i enable the  "Nintex Forms for Nintex Workflow" feature to be able to edi t a flexi task;s interaction form, i can no longer publish any workflow.

i get the following error when i try to publish 

02/21/2014 15:51:32.38 w3wp.exe (0x2EE0)                       0x3F28Nintex Forms                  Nintex Workflow Event         00000UnexpectedFailed to handle workflow upload starting event. Error: Object reference not set to an instance of an object.. Stack trace:    at Nintex.Forms.SharePoint.MobileAppForms.NfMobileFormsRepository.MarkFormAsDeletedIfExists(Guid workflowId)     at Nintex.Forms.SharePoint.EventHandlers.OnWorkflowUploadStarting.dBQ=(WorkflowUploadStartingEventReceiverContext dRQ=, Boolean& dhQ=)     at Nintex.Forms.SharePoint.EventHandlers.OnWorkflowUploadStarting.Execute(WorkflowUploadStartingEventReceiverContext eventArgs)ad71769c-5845-e08d-cb05-422a76965dd0

02/21/2014 15:51:32.38 w3wp.exe (0x2EE0)                       0x3F28Nintex Workflow 2013          Event Receivers               00000High    Failed to raise event to receiver or the receiver threw an exception. Type: WorkflowUploadStarting. Receiver assembly: Nintex.Forms.SharePoint, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c52d764dcf7ec883. Receiver class: Nintex.Forms.SharePoint.EventHandlers.OnWorkflowUploadStarting: System.NullReferenceException: Object reference not set to an instance of an object.     at Nintex.Forms.SharePoint.MobileAppForms.NfMobileFormsRepository.MarkFormAsDeletedIfExists(Guid workflowId)     at Nintex.Forms.SharePoint.EventHandlers.OnWorkflowUploadStarting.dBQ=(WorkflowUploadStartingEventReceiverContext dRQ=, Boolean& dhQ=)     at Nintex.Forms.SharePoint.EventHandlers.OnWorkflowUploadStarting.Execute(WorkflowUploadStartingEventReceiverContext eventArgs)     at Nintex.Workflow.Events.EventRecei...ad71769c-5845-e08d-cb05-422a76965dd0

02/21/2014 15:51:32.38*w3wp.exe (0x2EE0)                       0x3F28Nintex Workflow 2013          Event Receivers               00000High    ...verCollection.FireEvents(EventType type, SPWeb web, ReceiverContext eventArgs) (Build:3050)ad71769c-5845-e08d-cb05-422a76965dd0

02/21/2014 15:51:32.39 w3wp.exe (0x2EE0)                       0x3F28Nintex Workflow 2013          Web Service                   00000UnexpectedError saving from workflow export file.: System.Exception: Object reference not set to an instance of an object.      at Nintex.Workflow.Publishing.Publish.OR8=(XomlWorkflow Oh8=, SPList Ox8=, WorkflowRepository PB8=, Boolean PR8=, String& Ph8=)     at Nintex.Workflow.Publishing.Publish.AB8=(XomlWorkflow EB8=, Boolean ER8=, Boolean Eh8=, PublishOperationTrackingCollection Ex8=, Boolean FB8=, WorkflowRepository FR8=, Boolean Fh8=, Boolean Fx8=)     at Nintex.Workflow.Publishing.Publish.PublishAWorkflow(String wfName, NWActionConfigurations configs, Guid listId, SPWeb web, ImportContext importCtx, Boolean validate, SPContentTypeId contentTypeId, String changeNotes, String& publishWorkflowString)     at NintexWorkflowWS.PublishWorkflow(String wfName, String activityConfigs, Guid listId, Strin...ad71769c-5845-e08d-cb05-422a76965dd0