No valid data file found, script ends

PWS_graph_xx.php(33) loaded  =>PWS_graph_xx.php|01|2021-05-15|
PWS_graph_xx.php (37) include_once  =>./PWS_livedata.php
PWS_livedata.php (22) version =>PWS_livedata.php|01|2022-03-28|
PWS_livedata.php (25) include_once =>PWS_settings.php
PWS_settings.php (34) version =>PWS_settings.php|01|2022-12-23|
PWS_settings.php (38) include =>/home/web01047/domains/sottoventokiteschool.it/public_html/meteo/_my_settings/settings.php
PWS_settings.php (238) $defaultlanguage=it-it $used_lang =it-it $locale_wu=it-IT $lang_locale=it $lang_file=languages/lang_it.txt
PWS_settings.php (372) $units_used =scandinavia $windunit=m/s $tempunit=C $rainunit=mm $pressureunit=hPa $distanceunit=km $wu_unit=m
PWS_livedata.php (29) include_once =>PWS_shared.php
PWS_shared.php (21) version =>PWS_shared.php|01|2022-11-22|
PWS_livedata.php (39) $itsday =1
PWS_graph_xx.php (76) type set to baro from request baro
PWS_graph_xx.php (166) loading  =>./chartswudata/IBUTER1YMD.txt
PWS_graph_xx.php (193)Line-names contains {"success":false,"error":"Data could not be loaded from WU
437