Auto-run of custom unix command (custom wget) on NAS OS

I have taken that line directly fron "crontabs" file, copy and pasted and edited only ending - target script. :-D It only uses tabulators as spaces, thats why it looks (at this forum) broken.

I have also already tried line, that you have posted here..

I have also checked files, for encoding, it is UTF8 without BOM, so it is correct and same type as original linux files are.

I browsed dozens of pages with that fault, but they refer to missing first script line, or problem with paths in linux :( mostly ..

I am suspicious to problem with paths? But how that could be, if standalone .sh script works ok, if it is run.

EDIT: this is original crontabs file, just for check, i have never edited it or changed its content, before.

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user	command
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#