DocStatus is invalid for this operation Error When Posting SO Invoice and also Free Text Invoice

I am getting error "DocStatus is invalid for this operation" when i am trying to Post Sales Order Invoice and also
when I am trying to post the Free Text Invoice. Any suggestions to fix this?

Error: 

DocStatus is invalid for this operation

An Error Occured during Update.

Microsoft.Dynamics.Ax.Xpp.ErrorException: Exception of type 'Microsoft.Dynamics.Ax.Xpp.ErrorException' was thrown.
at Dynamics.Ax.Application.FormletterService.Run() in FormletterService.run.xpp:line 257
at Dynamics.Ax.Application.FormletterService.Postsalesorderinvoice(SalesFormLetterInvoiceContract _contract) in FormletterService.postSalesOrderInvoice.xpp:line 14
at FormletterService::postSalesOrderInvoice(Object , Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeInstanceCall(Object instance, String MethodName, Object[] parameters)
at Microsoft.Dynamics.Ax.Xpp.DictClass.Callobject(String _methodName, XppObjectBase _Called, Object[] varArgs)
at Dynamics.Ax.Application.SysOperationServiceController.Runoperation(Boolean _async) in SysOperationServiceController.runOperation.xpp:line 93
at Dynamics.Ax.Application.SysOperationServiceController.runServiceOperation(Object[] parameters) in SysOperationServiceController.runServiceOperation.xpp:line 22
at SysOperationServiceController::runServiceOperation(Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters)
at Dynamics.Ax.Application.SysDictClass.invokeStaticMethod(Object[] _params) in SysDictClass.invokeStaticMethod.xpp:line 26
at SysDictClass::invokeStaticMethod(Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters)
at Microsoft.Dynamics.Ax.Xpp.PredefinedFunctions.runAsInvoke(String className, String staticMethodName, Object[] parms, Object[]& exportInfolog)

Version: Dynamics AX 2012 R2

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