Missing Argument 2 for encrypt()

Missing Argument 2 for encrypt()

I had to rebuild my nginx server. Installed the same way I have every
time. Now all of a sudden one of my scripts wont authenticate people and I
get this message
2013/08/19 21:14:26 [error] 2392#0: *1667 FastCGI sent in stderr: "PHP
message: PHP Warning: Missing argument 2 for encrypt(), called in
*DIRECTORY_LOCATION*.php on line 139 and defined in
*DIRECTORY_LOCATION*.php on line 27" while reading response header from
upstream, client: *IP_ADDRESS*, server: *SERVER_NAME*, request: "GET
*DIRECTORY_LOCATION*.php HTTP/1.1", upstream:
"fastcgi://unix:/var/run/php5-fpm.sock:", host: "*SERVER_NAME*"
I understand this might be too general and I am sorry for that. I am just
not sure where to even begin or end to resolve this.