Fatal Error: Class 'String' not found in Model

I have a web application that has been working fine until recently when I switched operating systems. I migrated from Ubuntu to Arch Linux, backing up my application online. In the process I lost some directories and my web application no longer worked.

To solve this, I downloaded CakePHP again, copied the Controllers, Models and Views from my old project into my new copy of Cake, and modified my config to reflect my database.

I'm using Cake's AuthComponent and I'm getting this strange error message:

Fatal error: Class 'String' not found in /srv/http/bfm/app/Model/User.php on line 39

I didn't know what to make of the line number because line 39 is the last line in the file. I'm not particularly experienced with PHP outside of Cake so perhaps somebody else will be able to tell me what that might mean.

Each User has many Podcasts, and each Podcast belongs to a User. It was in accessing any page which used find to retrieve Podcasts and associated User objects that the error occurred.

Stranger still, actions managed by the UsersController worked fine. I was able to access my user login page with no problems, and I was redirected to login when I tried to create a new user, which is consistent with my Auth settings.

In any case, I decided to track down the cause of this error. I commented out my validation code and my beforeSave method, which used AuthComponent::password to hash and salt my users' passwords. Once I did this, the error vanished. With some further clumsy debugging through commenting, I figured out that it was specifically the beforeSave method that was causing problems. 

I tried following the trail of functions called from beforeSave, through AuthComponent and Security. Both of those files had App::uses('String', 'Utility') in them. What's more, I tried adding that line to User.php, and it didn't help solve the problem either.

My beforeSave method looks like this:

public beforeSave() {

if (isset($this->data[$this->alias]['password']) {

$password = $this->data[$this->alias]['password'];

$this->data[$this->alias]['password'] = AuthComponent::password($password);

}

return true;

}

When I replaced AuthComponent::password($password) with $password, the error was still there, which confused me, because I was sure String was needed for AuthComponent::password (via Security), and that was what was causing the trouble.

Maybe this was too long, but I wanted to give all the information I had, because I am well and truly stuck. I have no idea what's happening inside my code.

I can provide more information or code if it's useful. I just don't know where to begin.

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