Hello Marian,
Thanks for bringing this to my attention. It seems that this version of the leuven-wxsim script contains this error only with your latest.csv file. Very strange but I downloaded your csv to further investigate.
To remove the error, can you please
make a backup copy of the script: wdisplay/wsWxsimSA/wsWxsimGetFile.php
put the attached newer version in wdisplay/wsWxsimSA/ writing over the old version.
IF YOU GET NEW ERRORS: go back to your backup version of wsWxsimGetFile.php you made in step 1.
And please email me your version of this script.