No valid data file found, script ends

PWS_graph_xx.php(24) loaded  =>PWS_graph_xx.php|00|2019-12-15|
PWS_graph_xx.php (28) include_once  =>./PWS_livedata.php
PWS_livedata.php (25) version =>PWS_livedata.php|00|2019-12-15
PWS_livedata.php (28) include_once =>PWS_settings.php
PWS_settings.php (28) version =>PWS_settings.php|01|2019-12-15|
PWS_settings.php (32) include =>./_my_settings/settings.php
settings.php (2) version =>./_my_settings/settings.php|00|2021-10-20| 
PWS_settings.php (250) $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 =
PWS_graph_xx.php (46)  period set to day from request day
PWS_graph_xx.php (53) type set to rain from request rain
PWS_graph_xx.php (119)Line-names contains {"success":false,"error":"Data could not be loaded from WU
408