minifab up -i 1.4.12 failed on docker environment

[itaru2622]

minifab up -i 1.4.12 got failed for docker environment in netup phase as below:

# Preparing for the following operations: *********************
  verify options, download images, generate certificates, start network, network status, channel create, channel join, anchor update, profile generation, cc install, cc instantiate, discover
..................
# Running operation: ******************************************
  verify options
.
# Running operation: ******************************************
  download images
............
# Running operation: ******************************************
  generate certificates
......................................................................................................................................................................................................................
# Running operation: ******************************************
  start network
...................
# Start all ca nodes ******************************************
  One or more items failed
    non-zero return code
    non-zero return code
# Error! ******************************************************
  Unable to find image 'hyperledger/fabric-ca:1.4.12' locally
  docker: Error response from daemon: manifest for hyperledger/fabric-ca:1.4.12 not found: manifest unknown: manifest unknown.
  See 'docker run --help'.

# STATS *******************************************************
minifab: ok=304	failed=0