line length exception: 30
I tried:

./cudaHashcat-lite64.bin XXX ?F -o=output.txt

and got the error:

ERROR: hash: XXX, line length exception: 30
ERROR: invalid hash 'XXX'. double check -m parameter

So I added -m=0 because it is a hash generated by phpBB v.3 and I read this is MD5.

./cudaHashcat-lite64.bin XXX ?F -m=0 -o=output.txt

Still the same error. ?F is not the issue, I have this error with or without the "French" option. I don't need it here (because the output should be test00) but I'll need it later so I included it in my test.

I also tried without the $H$9, just in case. I thought "line length exception: 30" could mean the hash was too long. It is 34 char long. I still get the same error.

I apologise for asking all these questionsm it's my first attempt at using hashcat and I'm a bit awed by it.
yeah because -m 0 is not correct. I would suggest checking the hash type again (which should not have been posted here in the first place) and then reading the proper usage of hashcat and its options.
"MD5(phpBB3)" is not the same as plain md5
cudaHashcat-lite64 can not crack these.. doesnt support it
use oclHashcat-plus-0.07 instead
n u command should be like this::
./cudaHashcat-plus64.bin -m400 -a3 -1 ?F [your_hash_file] -o [output_file] ?1?1?1?1?1?1?1?1
and ?1?1?1?1?1?1?1?1 tells the length.. which is 8 now
this is slow algorithm.. so dont expect much
: )
Thank you very much, M@LIK. I'll try this right now Smile.

Sorry about posting the hash, I had not read the forum rules.

EDIT: Yes, it is slow like that, but at least it is working! With the test command included in the download it got several results in no time. I'll have to re-read the manual and try to understand all the options, to make it go faster. As it goes, with the command:

./cudaHashcat-plus64.bin -m400 -a3 -1 ?F example1.hash -o output.txt ?1?1?1?1?1?1?1?1

It says it is going to take 3 years and 169 days! lol

BTW, just in case I encounter it again, what does "line length exception: 30" mean, please?
dictionary and mutations are the way to go