ENOENT: command not found

[goliatone]

Handle error and give message explaining that the command was not found.

envset failed to execute provided command.
Ensure the following is a valid command.
slv docker-compose.tpl
{ Error: spawn slv ENOENT
    at exports._errnoException (util.js:1008:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:182:32)
    at onErrorNT (internal/child_process.js:348:16)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)
    at Module.runMain (module.js:577:11)
    at run (bootstrap_node.js:352:7)
    at startup (bootstrap_node.js:144:9)
    at bootstrap_node.js:467:3
  code: 'ENOENT',
  errno: 'ENOENT',
  syscall: 'spawn slv',
  path: 'slv',
  spawnargs: [ 'docker-compose.tpl' ] }