No valid data file found, script ends

PWS_graph_xx.php(25) loaded  =>PWS_graph_xx.php|01|2020-11-26|
PWS_graph_xx.php (29) include_once  =>./PWS_livedata.php
PWS_livedata.php (25) version =>PWS_livedata.php|00|2020-09-23|
PWS_livedata.php (28) include_once =>PWS_settings.php
PWS_settings.php (28) version =>PWS_settings.php|01|2020-11-28|
PWS_settings.php (32) include =>/web/htdocs/www.bitlinemeteo.com/home/stazioni/rifugiostivo/_my_settings/settings.php
settings.php (2) version =>./_my_settings/settings.php|00|2023-04-13| 
PWS_settings.php (158) $defaultlanguage=it-it $used_lang =it-it $locale_wu=it-IT $lang_locale=it $lang_file=languages/lang_it.txt
PWS_settings.php (256) $units_used =metric $windunit=km/h $tempunit=C $rainunit=mm $pressureunit=hPa $distanceunit=km $wu_unit=m
PWS_livedata.php (32) include_once =>PWS_shared.php
PWS_shared.php (24) version =>PWS_shared.php|00|2019-12-12|
PWS_livedata.php (42) $itsday =1
PWS_graph_xx.php (51)  period set to day from request day
PWS_graph_xx.php (58) type set to wind from request wind
PWS_graph_xx.php (143) loading  =>./chartswudata/IARCO21YMD.txt
PWS_graph_xx.php (170)Line-names contains {"success":false,"error":"Data could not be loaded from WU
418