Error on executing fpclose.vi when using FP-1000 and two FP-TC-120 modules

Question

I have an error occuring in my LabVIEW program when closing the Field Point connections.
I am using LV8.5 and im connecting to a FP-1000 controller (RS-232 native port) which connects to two FP-TC-120 modules, under XP.
The error i get is 'Error 33589' caused by 'FPClose.vi', it is actually the second 'FPClose.vi' that produces the error as indicated in the picture by the giant arrow. Strangely it doesn't seem to have an effect of the program and it runs and disconnects as it should, its mostly just bugging me.
I can't find this error listed anywhere, nor can i find a nice long list of the errors.
I have a niggling feeling that when i close the FP read tags with the FPClose.VI i'm actually closing connection to the FP module and hence not closing the system down as was intended. 
I would be grateful is someone would instruct me as to the cause of the error, and what i should be doing to correctly close down the FP module. 
Solved!
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Attachments:
fperror33589.jpg ‏190 KB

Answer 1

Well I managed to get to the bottom of the problem, it was not caused by FPClose!
The errors where obviously being cascaded through FPClose and while the 'error out' stated that the source was the second 'FP Close.vi' it was actually from the second 'FP Read.vi'. The fact that the IAK was in a loop was not the cause of my problem, however it is a clear sign of poor programming!
FieldPoint Read Error 33589 actually relates to the fact that some channels are deteremined to be OpenLoop. In my case i had all channels of the first bank connected to K-Type thermocouples, but only 2 channels of the second bank connected, and hence the error arose in the second 'FP Read' and cascaded to the second 'FP Close'. To consider it an error is actually a misnomer as it is actually a warning and does not have an influence on the running of the program.
I believe the original example I posted was written for LV 6.1 and FP 3.x. I have updated my own example to the updated methods used in LV 2011 and FP 6.0.9, they run much smoother than the previous method! Hopefully this might help someone else in the future.
Attachments:
NewFPExample.jpg ‏106 KB
NewFieldPointExample.vi ‏16 KB