You are not logged in.
f.e.:
~/.config/autostart/conky.desktop
[Desktop Entry]
Type=Application
Exec=sh "/home/grappas/.conky/conky-startup.sh"
Hidden=false
NoDisplay=false
X-GNOME-Autostart-enabled=true
Name[en_IN]=Conky
Name=Conky
Comment[en_IN]=
Comment=doesn't autostart anymore.
desktop-file-validate confirms it is conform.
or
~/.local/share/applications/TEES.desktop
[Desktop Entry]
Name=TEES
Exec="~/.local/share/applications/ts.sh"
Type=Applicationis not recognized by any launcher other than plain text file

desktop-file-validate also confirms it is conform.
It worked before like a charm.
Offline
For me, conky.desktop has this content
[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Icon=conky-logomark-violet
Name=Conky
Comment=Light system monitor for X
Exec=/home/robson/.conky/conky-startup.sh
Hidden=falseEverything works fine.
Arch Linux Xfce - 64Bit Linux User #621110
Offline