mcrypt trouble

Hello, I'm trying to do mcrypt encryption but I continue to get the following error: Warning: mcrypt module initialization failed and this is the line of code that I get the error from: $string = mcrypt_cbc("MCRYPT_DES", $key, $test, "encrypt"); I've also tried several different version of using the function mcrypt_encrypt as well but nothing seems to work. In my phpinfo file, this is what I have for the mcrypt module: Version: 2.4.x Supported Ciphers: cast-128 cast-256 enigma xtea arcfour panama safer-sk64 saferplus des tripledes blowfish gost rc2 safer-sk128 threeway serpent wake loki97 rijndael-128 rijndael-192 rijndael-256 twofish blowfish-compat Supported modes: stream cbc cfb ecb ofb nofb Does someone know if I am coding something wrong or if there is a problem with the installation of php (v 4.0.6) on the server that I am on? Thanks for the help. -- Dominic