PNA Guided Calibration: GPIB write error in for loop

Hi,
I have a LabVIEW program that creates a Guided Power Calibration on a PNA.
After initializing everything properly, I have a for loop that loops through all the manual steps that the user must go through (ex: Connect Channel A of Power meter to Port 1" "Connect male Short to port 1" etc).
The problem is, the program displays an error at the first command: sens:corr:coll:guid:acq STAN1
I says there is an error with the GPIB Write function.
Here are the commands I send:
SYSTRES
DISPlay:WINDow2TATE ON
CALCulate2ARameterEFine:EXT 'MyMeas',S21
DISPlay:WINDow2:TRACe1:FEED 'MyMeas'
CALC1AREL 'CH1_S11_1'
SENS:FREQTAR 2e9
SENS:FREQTOP 4e9
SENSWEOINTS 3
SENS:CORR:COLL:GUID:CONNORT1 'APC 2.4 male'
SENS:CORR:COLL:GUID:CONNORT2 'APC 2.4 male'
SENS:CORR:COLL:GUID:CKITORT1 '85056D'
SENS:CORR:COLL:GUID:CKITORT2 '85056D'
SENSe:CORRection:COLLect:GUIDedSENsor1 ON
SYSTem:COMMunicateSENsor gpib, "13"
SENSe:CORRection:COLLect:GUIDedSENsor1OWer:LEVel -20
sens:corr:coll:guid:init
sens:corr:coll:guid:steps?
//for loop from 1 to total_number_of_steps
sens:corr:coll:guid:desc? <step#>
sens:corr:coll:guid:acq STAN<step#>
The program quits right at the first step, when I send "sens:corr:coll:guid:acq STAN1", although the command is executed.
Also, the VBScript with the same commands works fine.
Can anybody help me? I've been stuck for a while now.
I attached the block diagram of the for loop.
Thanks in advance,
Nicolas
Attachments:
Guided cal for loop.vi ‏27 KB

Sending SENS:corr:coll:guid:acq STAN1 \n gives me a different error: -101 "Invalid Character".
From my different attempts at figuring this out, I thought the problem would come from LabVIEW, since the vbscript with the same commands works on the PNA.
I also modified the for loop because I thought each iteration should be linked to the previous one with the error wire (see attached).
I still have the same issue, only the first iteration is executed, then the program quits.
Attachments:
Guided cal for loop.vi ‏28 KB

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