Oracle error 12154 while importing DMP file

My Setup

I'm running Windows 7 64-bit, using Oracle DB 11g R2 for Windows 64-bit. I have Oracle SQL Developer Release 3.0 (4.0.2.15.21) as the GUI for my database.

Question

I followed the instructions from this post on how to import an Oracle .DMP file. I issued this command into the command prompt: C:\>imp sys@dev/password12345 FROMUSER=FOOADMIN TOUSER=FOOADMIN file=c:\fooadmin.dmp full=yes

It then prompts me for a password in which I enter the correct one and then I receive this error:

IMP-00058: ORACLE error 12154 encountered
ORA-12154: TNS:could not resolve the connect identifier specified
IMP-00000: Import terminated unsuccessfully

Actual Question: How do I fix this error and be able to import the .dmp file successfully? Or what are some steps I can head towards to potentially get this working…?

My Files & What I've Done

I have looked through countless posts on this same issue. My tnsnames.ora, listener.ora, & sqlnet.ora are located in this directory: C:\oracle\product\11.2.0\dbhome\NETWORK\ADMIN

My connection in my tnsnames.ora file looks like this (I have also tried to put my computer name as the HOST, instead of 127.0.0.1)…

DEV =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    )
  (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = DEV)
  )
 )

PATH Variables

I added the following to my PATH (I realize there may be some unnecessary item in there, I just wanted to be on the safe side. ):
C:\oracle\product\11.2.0\dbhome\bin;C:\oracle\product\11.2.0\client_1;C:\oracle\product\11.2.0\client_1\bin;%ORACLE_HOME%\bin;

I also created two more variables in my System Variables…

TNS_ADMIN C:\oracle\product\11.2.0\dbhome\NETWORK\ADMIN

TNS_NAMES C:\oracle\product\11.2.0\dbhome\NETWORK\ADMIN