[daip] POSSM errors {External}

[Wara Chamani]

Dear AIPS team,
I am using ParselTongue software to run AIPS tasks from a Python script 
developed by people from the JIVE team. The pipeline is originally designed 
to calibrate EVN datasets. The main script is EVN.py which needs external 
evn_aips_tasks.py and evn_funcs.py. These are found at 
https://www.jive.eu/jivewiki/doku.php?id=parseltongue:grimoire#the_evn_pipeline
I am running their script for non-EVN data. The pipeline can load the data 
and then when it goes to the step for plotting, the pipeline crashes where 
POSSM is run. The AIPS error message I get is the following

POSSM4: Task POSSM  (release of 31DEC23) begins
POSSM4: UVGET: doing no flagging this time
POSSM4: POSSUV: at visibility number  1
POSSM4: Averaged  6 visibilities from total data set of  196
POSSM4: POSSUV: for antenna(s) GS
POSSM4: Covering timerange  00/18:00:01 -  00/18:00:06
POSSM4: Will plot  128 channels *  8 IFs polarization RR
POSSM4: FILLPL: Amplitude mean:  1.2312E+00  rms:  3.6756E-01
POSSM4: FILLPL: Phase mean:  0.0000E+00  rms:  0.0000E+00
POSSM4: ZDIR: COULD NOT TRANSLATE LOGICAL =
POSSM4: ZDIR:
POSSM4: GINIT ERROR  2 ON OPENING TASK HELP FILE
POSSM4: CATIO: CATBLK  1 IN USE, CAN'T WRITE
POSSM4: DELEXT: CATIO WRITE ERROR  4
POSSM4: REFRSH: ERROR  42 RECEIVED FROM PLCREA
POSSM4: ZFIO: LUN = 26 NOT OPEN IN FTAB
POSSM4: MTICS: GRAPH LABEL WRITING ERROR  1 FROM GVEC
POSSM4: ZFIO: LUN = 26 NOT OPEN IN FTAB
POSSM4: ZCLOSE: DOES NOT PERFORM TEXT FILE CLOSES AS OF 15OCT87
POSSM4: DELEXT: NO EXTENSION FILE OF TYPE PL
POSSM4: Purports to die of UNNATURAL causes

It gets stuck after FILLPL and I do not quite understand what is happening 
here. I have never encountered such errors when running the same parameters 
inside AIPS.
Do you have any comments or advice on this? At least I would like to 
understand why POSSM is crashing like that.
My best regards,
Wara Chamani