Error: Module version mismatch. Expected 13, got 11.

[jwlrs]

I'm getting this trying to start run:

plunker_run# node server.js
path.existsSync is now called fs.existsSync.

/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/coffee-script/lib/coffee-script/coffee-script.js:211
Module._extensions[extension](this, filename);
^
Error: Module version mismatch. Expected 13, got 11.
at Module.load (/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/coffee-script/lib/coffee-script/coffee-script.js:211:36)
at Function.Module._load (module.js:305:12)
at Module.require (module.js:357:17)
at require (module.js:373:17)
at Object. (/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/node-sass/sass.js:12:13)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/coffee-script/lib/coffee-script/coffee-script.js:211:36)
at Function.Module._load (module.js:305:12)
at Module.require (module.js:357:17)
at require (module.js:373:17)
at Object. (/Users/USER/SOMEDIR/plunker/plunker_run/index.coffee:72:10)
at Object. (/Users/USER/SOMEDIR/plunker/plunker_run/index.coffee:403:4)
at Module._compile (module.js:449:26)
at Object.loadFile (/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/coffee-script/lib/coffee-script/coffee-script.js:182:19)
at Module.load (/Users/USER/SOMEDIR/plunker/plunker_run/node_modules/coffee-script/lib/coffee-script/coffee-script.js:211:36)
at Function.Module._load (module.js:305:12)
at Module.require (module.js:357:17)
at require (module.js:373:17)
at Object. (/Users/USER/SOMEDIR/plunker/plunker_run/server.js:11:14)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:349:32)
at Function.Module._load (module.js:305:12)
at Function.Module.runMain (module.js:490:10)
at startup (node.js:123:16)
at node.js:1200:3

[jwlrs]

Important extra info: this was with Node 0.11