Solved SOLVED:script does not run at startup

[DJMatrix-HU3]

I do not understand why my script does not execute at initialization I've researched a lot in google without success.

/recalbox/share/system/custom.sh:

#!/bin/sh
#/recalbox/share/system/custom.sh
cd /recalbox/share/system/
python counter.py &

the script normally runs in terminal:

python counter.py

Help ???

SOLVED:

cd /recalbox/share/system/
chmod u+x counter.py
chmod u+x custom.sh