NVM in nodejs returns "no shasum" error

I installed NVM on my system and tried to install a newer version of nodejs by the following commands:

nvm install v0.8.23

and

nvm install 0.8.23

But I get the following error:

/usr/bin/which: no shasum in ($PATH)
######################################################################## 100.0%
Checksums do not match.
Binary download failed, trying source.
Additional options while compiling: 
nvm: install N/A failed!

and then nothing happens. How can I fix this problem?!

Update-1__________________________________________

I tried changing the permission and creating an alias but they didn't effect anything. I made a symlink shasum -> sha1sum and the output changed (but still I'm not having ):

######################################################################## 100.0%
Checksums do not match.
Binary download failed, trying source.
Additional options while compiling: 
nvm: install N/A failed!