Workflow stuck

I found this error log on batch job history: Microsoft.Dynamics.Ax.Xpp.ErrorException: Exception of type ‘Microsoft.Dynamics.Ax.Xpp.ErrorException’ was thrown. at Dynamics.Ax.Application.SysWorkflow.internalFault(WorkflowContext _workflowContext, String _user, String _faultMessage) in SysWorkflow.internalFault.xpp:line 42 at Dynamics.Ax.Application.SysWorkflow.fault(WorkflowContext _workflowContext, String _user, String _faultMessage) in SysWorkflow.fault.xpp:line 32 at Dynamics.Ax.Application.SysWorkflowQueue.dispatch(Guid _affinity) in SysWorkflowQueue.dispatch.xpp:line 181 at Dynamics.Ax.Application.SysWorkflowQueueTask.Run() in SysWorkflowQueueTask.run.xpp:line 11 at Dynamics.Ax.Application.BatchRun.runJobStaticCode(Int64 batchId) in BatchRun.runJobStaticCode.xpp:line 54 at Dynamics.Ax.Application.BatchRun.runJobStatic(Int64 batchId) in BatchRun.runJobStatic.xpp:line 13 at BatchRun::runJobStatic(Object[] ) at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters) at BatchIL.taskThreadEntry(Object threadArg) what does these mean?