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If you want get rid off error message you can redirect the error standard output (associated to file descriptor 2) to the trash (/dev/null)
ls -t /PROCESSED/* | tail +9 | xargs rm 2>/dev/null

looks more like you have less than 8 files, and so the command rm does not appreciate to be called for nothing and reminds you its usage...

To be set in the crontab :
ls -t /PROCESSED/* | tail +9 | xargs rm

which OS are you running ?
tail doesn't have the "+" option ?
(i have tested it on my system and it worked : FreeBSD, the + option also exists on Solaris)
(if the tail fails, it is normal that...

The + option may not be available in all unix flavors. The + option takes from a line forward. Thus
file1=
a1
b2
c3
d4

command like the following
>tail -n +2 file1

gives
b2
c3
d4

...

Ok then ...
ls -t /PROCESSED/* | tail -n +9 | xargs rm