mach fails with error on non-existent classpath dir #55

{mach/dependencies [[aero "1.1.2"]]
 hello (println "Hello")}

Writing Mach classpath to .mach/cp
evalmachine.<anonymous>:98
throw ex;
^

Error: ENOENT: no such file or directory, open '.mach/cp'
    at Object.fs.openSync (fs.js:652:18)
    at fs.readFileSync (fs.js:553:33)
    at evalmachine.<anonymous>:4299:43
    at evalmachine.<anonymous>:4346:43
    at mach$core$preprocess_dependencies_$_state_machine__4__auto____1 (evalmachine.<anonymous>:4367:4)
    at mach$core$preprocess_dependencies_$_state_machine__4__auto__ (evalmachine.<anonymous>:4383:72)
    at cljs$core$async$impl$ioc_helpers$run_state_machine (evalmachine.<anonymous>:90:74)
    at cljs$core$async$impl$ioc_helpers$run_state_machine_wrapped (evalmachine.<anonymous>:93:63)
    at evalmachine.<anonymous>:4398:67
    at Immediate.cljs$core$async$impl$dispatch$process_messages [as _onImmediate] (evalmachine.<anonymous>:16:6)