build fails, what version of npm and or node should be used?

[webmutation]

30658 error node v4.4.3
30659 error npm v3.8.8
30660 error No compatible version found: babel-helpers@^6.8.0
30660 error Valid install targets:
30660 error 6.6.0, 6.5.0, 6.5.0-1, 6.4.5, 6.4.0, 6.3.13, 6.3.0, 6.2.4, 6.1.20, 6.1.18, 6.1.17, 6.1.16, 6.1.13, 6.1.12, 6.1.10, 6.1.9, 6.1.8, 6.1.7, 6.1.6, 6.1.5, 6.1.4, 6.1.2, 6.0.17, 6.0.15, 6.0.14, 6.0.12, 6.0.2, 6.0.0