Fatal error: Only variables can be passed by reference / line 588

Note, this is between steps 6 and 7. It didn't appear to be related to the computed field. I'll keep investigating...

On another content type, I am able to import without the fatal error, but I'm getting another error. The field_provider array looks a little fishy. Note I uploaded both 93 in the Provider field and the title of the Nodereference field, but both returned this error. Tried making the CCK field multivalue and 1 value also, to no avail.

Provider: found no valid post with that title.

values = Array
(
    [created] => 
    [node_import_build_mode] => 1
    [title] => Another Rock Family Clinic
    [cck:field_provider:nid] => Array
        (
            [0] => 93
        )

    [format] => 1
    [body] => New Quarters
    [type] => contact
    [revision] => 1
    [log] => Imported with node_import.
    [uid] => 1
    [sticky] => 0
    [promote] => 0
    [status] => 1
    [path] => 
    [comment] => 0
    [name] => admin
    [taxonomy] => Array
        (
        )

    [field_provider] => Array
        (
            [0] => Array
                (
                    [nid] => Array
                        (
                            [nid] => 93
                        )

                )

        )

    [op] => Preview
)

Update: Still getting the error, but nevermind about the structure looking fishy. Saw the comment in node_import/supported/cck/nodereference.inc. :

// This is just braindead - because of some wrapper, the value
        // needs to be:
        // array(0 => array('nid' => array('nid' => 'name')))
        // instead of:
        // array(0 => array('nid' => 'name')).

Update #2 Fixed nodereference import by changing the nodereference widget to select list instead of autocomplete widget.

Figured it out. The error was caused by a multiline text field that had been assigned an input format. When I changed it to plain text, I no longer got the error. Hope this helps someone, somewhere. If you have any questions for me to help track down the error, let me know. Whew!