WorkFlow Error when publishing

Hello, 

I am having errors publishing workflows. This was working and all of a sudden stopped. From the error message I am taking it as a permissions issue? 



Here is the code it spits out: 

System.InvalidOperationException: Operation failed with error System.UnauthorizedAccessException: Attempted to perform an unauthorized operation.
   at Microsoft.SharePoint.SPAppPrincipalManager.GetManager(SPWeb web)
   at Microsoft.SharePoint.WorkflowServices.SPWebWorkflowSecurityContext.EnsureAppPrincipal(SPWeb elevatedWeb)
   at Microsoft.SharePoint.WorkflowServices.SPWebWorkflowSecurityContext.<SetupApplicationEcosystem>b__3()
   at Microsoft.SharePoint.SPSecurity.<>c__DisplayClass5.<Run

Anyone have any thoughts? This happens with all sorts of workflows, even basic ones as shown in the above example!

Thanks,

Will