Help with mask

Hey, Im really new to this just started sorry if this is quite noobish.
Im trying to crack a sha 256 encryption, if I try the command "hashcat64.exe -m 1400 -a 3 -o cracked.txt hash.txt" everything works fine the problem is when i try to use mask I tried the command "hashcat64.exe -m 1400 -a 3 -1 ?1?d hash ?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l?l -o cracked.txt hash.txt"  and I get the error "Hash 'hash': Line-length exception No hashes loaded."

What I want to do is to test only the possiblities that have 64 characters with "abc(..)z0123456789"

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