[root@localhost first-network]# ./byfn.sh -m generate -c mychannel
Generating certs and genesis block for with channel ‘mychannel’ and CLI timeout of '10’
Continue (y/n)? y
proceeding …
which: no cryptogen in (/usr/local/src/go/src/github.com/hyperledger/fabric-samples/first-network/…/bin:/usr/local/src/go/src/github.com/hyperledger/fabric-samples/first-network:/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/bin:/root/bin)
cryptogen tool not found. exiting

请问这个问题如何解决