Cannot Modify Header Error

Hi it’s me again. It seems I have another modify header error. I strongly suspect this issue is related to the previous modify header problem you fixed for me. I just didn’t find it until now because I hadn’t saved a post until today. This time it occurs only when I edit a post. After saving an edited post I get a white screen which reads:

Warning: Illegal string offset ‘type’ in /home3/public_html/canigivemydog.com/wp-content/themes/thesis_18/lib/admin/options_post.php on line 168

Warning: Cannot modify header information – headers already sent by (output started at /home3/public_html/canigivemydog.com/wp-content/themes/thesis_18/lib/admin/options_post.php:168) in /home3/qatarsuc/public_html/canigivemydog.com/wp-admin/post.php on line 235

Warning: Cannot modify header information – headers already sent by (output started at /home3/qatarsuc/canigivemydog.com/wp-content/themes/thesis_18/lib/admin/options_post.php:168) in /home3/qatarsuc/public_html/canigivemydog.com/wp-includes/pluggable.php on line 1121

So I went to that particular line within options_post.php – containing ‘type’ and it reads:

if (($meta_field[‘type’][‘type’] == ‘checkbox’) && is_array($meta_field[‘type’][‘options’])) {
foreach ($meta_field[‘type’][‘options’] as $option_name => $option) {
if ((bool) $new_data[$option_name] != (bool) $option[‘default’])
$new_data[$option_name] = (bool) $new_data[$option_name];
elseif ((bool) $new_data[$option_name] == (bool) $option[‘default’])
unset($new_data[$option_name]);

Possible to help! Thank you kindly.
James

https://wordpress.org/plugins/device-theme-switcher/