Phalcon Devtools 1.2.3: "WebtoolsController handler class cannot be loaded"

Phalcon Devtools 1.2.3: "WebtoolsController handler class cannot be loaded"

I input this:
$ phalcon create-project store --enable-webtools
I get a:
Phalcon DevTools (1.2.3)
Success: Controller "index" was successfully created.
Success: Project "store" was successfully created.
and then when i access: http://localhost/store/webtools
i get a:
"WebtoolsController handler class cannot be loaded"
What's the problem?