Hi,
I am wondering if the status light on the FP-1600 starts blinking when you receive this message. Please also take a look at the knowledgebase linked below that might give an idea about the problem.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/8adb5e3d3f05214e86256b140052232f?OpenDocument
Remzi A.