Error 224 (0xE0) means CKR_TOKEN_NOT_PRESENT.
You are trying to connect to a token in a slot that doesn't contain any token.
The list of the error messages is here: http://wiki.ncryptoki.com/How-NCryptoki-manages-PKCS-11-errors.ashx
Consider that NCryptoki is a wrapper to native PKCS#11 dll. Errors and crashes usually comes from the native dll.