npm start error

[rootiny]

hello:
i do as readme says, and get these errors as follows:

16 error Linux 4.4.0-157-generic
17 error argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
18 error node v4.2.6
19 error npm v3.5.2
20 error file sh
21 error code ELIFECYCLE
22 error errno ENOENT
23 error syscall spawn
24 error [email protected] start: forever start app.js
24 error spawn ENOENT
25 error Failed at the [email protected] start script 'forever start app.js'.
25 error Make sure you have the latest version of node.js and npm installed.
25 error If you do, this is most likely a problem with the ProjectRTC package,
25 error not with npm itself.
25 error Tell the author that this fails on your system:
25 error forever start app.js
25 error You can get information on how to open an issue for this project with:
25 error npm bugs ProjectRTC
25 error Or if that isn't available, you can get their info via:
25 error npm owner ls ProjectRTC
25 error There is likely additional logging output above.
26 verbose exit [ 1, true ]