Fatal error: Cannot use assign-op operators with overloaded objects nor string offsets

just tried to set up a fork of Corolla 7.x-3.0-rc1, exact same condition.

thank god for $conf['theme_default'] = 'garland'; in settings.php

UPDATE
Just bumped everything back to AT 7.x-2.3 and Corolla 7.x-2.2 , a set up I have used previously and everything seems fine so I don't think its my setup that's causing the problem

ahhhh, just shut down Jeff, currently in bed with the tablet, I really appreciate the prompt reply but its gonna be the morning before i get back to this, im in gmt+7

I tried commenting out $vars['attributes']['class'] .= ' image-style-' . $style_name_class earlier but it was just throwing a major error with site unreachable. I also tried commenting out the whole section, same situation.

Will repost as per your request as soon as i get the chance.

Feel free to bump down the priority on this as its still on a dev site although hoping to push it live in the next day or two.

Right, sorry, hectic day yesterday and only had an hour to try and recreate this, sadly I failed to do that then.

This morning, attacked it fresh, this was my process.

• Disabled all themes apart from Garland.
• Extracted fresh copy of AdaptiveTheme 7.31
• Copied the directory 'at_subtheme' into the sites/default/themes/ directory and renamed it 'azlaw_d7'
• Renamed 'adaptivetheme_subtheme.info' to 'azlaw_d7.info'
• opened the 'azlaw_d7.info' file and renamed it from 'AT Subtheme' to 'AZ Law D7'
• Opened 'theme-settings.php' and did find/replace on 'adaptivetheme_subtheme' and changed to 'azlaw_d7'
• Opened 'template.php' and did find/replace on 'adaptivetheme_subtheme' and changed to 'azlaw_d7'
• Enabled the Devel module (in case I couldnt when locked out)
• flushed the cache
• ran cron
• set 'AZ Law D7' as default them and then disabled 'Garland'
• Into theme settings, didnt change anything (although maybe some settings persisted from the opther day) and clicked save.

Again faced with a white screen containing only the text

Fatal error: Cannot use assign-op operators with overloaded objects nor string offsets in C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc on line 874

Opened the file '\adaptivetheme\at_core\inc\preprocess.inc' and commented out Line 874 $vars['attributes']['class'] .= ' image-style-' . $style_name_class; and added dsm($vars['attributes']); at the bottom of the 'adaptivetheme_preprocess_image()' function.

That function now reads as:

/**
 * Preprocess variables for theme_image()
 */
function adaptivetheme_preprocess_image(&$vars) {

  // Initialize the variable if there isn't one
  if (!isset($vars['attributes']['class'])) {
    $vars['attributes']['class'] = array();
  }

  // Some modules set the style name even when its empty, such as User Badges
  // module, so initialize the class name variable with a "none" class
  $style_name_class = 'none';
  
  // If there really is a style name use it for the class
  if (isset($vars['style_name']) && !empty($vars['style_name'])) {
    $style_name_class = drupal_html_class($vars['style_name']);
  }

  // In the first instance we assume class attributes is an array, as it should be,
  // and add the image style class
  if (is_array($vars['attributes']['class'])) {
    $vars['attributes']['class'][] = 'image-style-' . $style_name_class;
  }
  else {
    // Else it's a string, workaround for Media module bug: http://drupal.org/node/1722146
    // and User Badges bug: http://drupal.org/node/1748394
    // $vars['attributes']['class'] .= ' image-style-' . $style_name_class;
  }
  dsm($vars['attributes']); 
}

I then refreshed the page and took a screenshot of the output, see attached file azlaw-krumo-screenshot.jpg

I have also attached a screenshot of the modules page so you can see what modules are enabled, see the attached file modules-screenshot.jpg

On a side note, D.O. wimped out at the meagre 166kb krumo screenshot and dumped this to my screen:
{"status":true,"data":"\u003cdiv class=\"messages messages-error clear-block\"\u003eValidation error, please try again. The file you attempted to upload may be too large. If this error persists, please contact the site administrator.\u003c\/div\u003e\n"}
This had me uploading the modules screenshot in trepidation as it was 2.8MB!

Cleared my browser cache, logged in to D.O again and attempted the upload once more.

Text dump from Krumo output

Error
Status message

    AZ Law d7 is now the default theme.
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  
        ... (Array, 1 element)
            class (Array, 2 elements)
                0 (String, 10 characters ) screenshot
                1 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  

    s

Warning message

    No update information available. Run cron or check manually.
    No update information available. Run cron or check manually.

The website encountered an unexpected error. Please try again later.

edit
screenshots attached to next comment

screenshots attached.

maybe easier to show you at a glance the currently enabled modules to save you wading through that modules page screenshot:
enabled modules:

• Block 7.17
• Blog 7.17
• Comment 7.17
• Contact 7.17
• Dashboard 7.17
• Database logging 7.17
• Field 7.17
• Field SQL storage 7.17
• Field UI 7.17
• Filter 7.17
• Help 7.17
• List 7.17
• Menu 7.17
• Node 7.17
• Number 7.17
• Options 7.17
• Path 7.17
• PHP filter 7.17
• Search 7.17
• Statistics 7.17
• Syslog 7.17
• System 7.17
• Taxonomy 7.17
• Text 7.17
• Tracker 7.17
• Update manager 7.17
• User 7.17
• Administration menu 7.x-3.0-rc3
• Chaos tools 7.x-1.2
• Devel 7.x-1.3
• Meta tags 7.x-1.0-beta4
• Backup and Migrate 7.x-2.4
• Pathauto 7.x-1.2
• Search 404 7.x-1.2
• Site map 7.x-1.0
• Token 7.x-1.4
• Global Redirect 7.x-1.5
• PDF version 7.x-1.2
• Printer-friendly pages 7.x-1.2
• Send by email 7.x-1.2
• CAPTCHA 7.x-1.0-beta2
• Image CAPTCHA 7.x-1.0-beta2
• Views 7.x-3.5
• Views UI 7.x-3.5
• XML sitemap 7.x-2.0-rc2

Edit
nope, crap screenshots, didnt notice that, check next comment for full screenshots

better screenshots

The previous Krumo printouts where taken whilst the site was browser was still attempting to view the theme selection page at http://localhost/dev/azlawpartner/site/admin/appearance

Alas, when attempting to view the site root at http://localhost/dev/azlawpartner/site/ the Krumo output seems to point to the possible cause:

Krumo output as text dump

Error
Status message

        ... (Array, 1 element)
            class (Array, 3 elements)
                0 (String, 10 characters ) print-icon
                1 (String, 17 characters ) print-icon-margin
                2 (String, 16 characters ) image-style-none
        Krumo version 0.2.1a
        | http://krumo.sourceforge.net
        [Click to expand. Double-click to show path.] Called from C:\xampp\xampp\htdocs\dev\azlawpartner\site\sites\default\themes\adaptivetheme\at_core\inc\preprocess.inc, line 876  

    s

The website encountered an unexpected error. Please try again later.

Will try and disable the following modules in the database and see what results it gives me:

• PDF version 7.x-1.2
• Printer-friendly pages 7.x-1.2
• Send by email 7.x-1.2

see attached screenshot also

Used PHP-MyAdmin to view the site {system} table and set status = 0 for the following modules:

• print
  sites/default/modules/print/print.module
• print_mail
  sites/default/modules/print/print_mail/print_mail.module
• print_pdf
  sites/default/modules/print/print_pdf/print_pdf.module

Nothing, still the same Krumo output and the same error when un-commenting Line 874 on adaptivetheme\at_core\inc\preprocess.inc

Its gotta be coming from the Print module surely (http://drupal.org/project/print), incidentally, using DomPDF (http://code.google.com/p/dompdf/) for PDF generation.

Update
re-enabled 'Garland' through the settings.php switch to allow me to uninstall the Print module completely from the database, no change, however when viewing the site root it is no longer showing the Krumo output, odd?

Now that the module is completely uninstalled, un-commented Line 875 in preprocess.inc and again, same deal pointing to Line 874.

currently running XAMPP on my dev machine with PHP 5.3.1

Will try and upgrade to the latest PHP version over the next few days if I can get the chance and see if it makes any difference. Gonna bump back down to AT 7.x-2.3 for now as I gotta get this project rolling but will continue to try and debug this as I am sure it will rear its head again at some point in the future.

I have set this issue to 'postponed' for now as it would be handy to post my findings back into here when i get the chance to continue debugging it.