为什么签名证书需要`-CAcreateserial`参数？

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openssl x509 \
    -req -sha256 \
    -days "365" \
    -CAcreateserial \
    -CA "ca.crt" -CAkey "ca.key" -passin "pass:abcd" \
    -in "csr.csr" -extfile "ext.ext" \
    -out "c.crt"`

/test/ca.srl: No such file or directory
140413509251520:error:06067099:digital envelope routines:EVP_PKEY_copy_parameters:different parameters:../crypto/evp/p_lib.c:93:
140413509251520:error:02001002:system library:fopen:No such file or directory:../crypto/bio/bss_file.c:72:fopen('/test/ca.srl','r')
140413509251520:error:2006D080:BIO routines:BIO_new_file:no such file:../crypto/bio/bss_file.c:79:

openssl x509 \
    -in "c.crt" \
    -noout \