in reply to Oracle::SQLLoader Error

That line in the source code references the environment variable "Oracle_Home" - perhaps that has not been set.
From the Oracle-SQLLoader README:
You should have the following environment variables set: ORACLE_HOME - the location of the Oracle installation ORACLE_SID - the database instance name ORACLE_USERID - the username and password to connect to the database + as the format is username/password (e.g. scott/tiger)