Fatal error: Cannot redeclare class

I think I found the issue:

LINE 511 : if( !class_exists( ‘acf_walker_taxonomy_field_checklist’ ) )
needs to be :
LINE 511 : if( !class_exists( ‘ACF_Walker_Taxonomy_Field_Checklist’ ) )

That didn’t help. Is this happening to anyone else?

Same trouble.

WordPress 3.42
Thesis 1_85
ACF 3.5.4.1 with the Gallery Add On.

Fatal error: Cannot redeclare class acf_walker_taxonomy_field_checklist in .../html/tmv-development-subdomains/classdevelopment/wp-content/plugins/advanced-custom-fields-taxonomy-field-add-on/taxonomy-field.php on line 513

Same thing. That error causes a 500 page to show up.

Here’s what I’m getting:

[03-Jan-2013 21:36:36 UTC] PHP Fatal error: Cannot redeclare class acf_walker_taxonomy_field_checklist in /var/www/wpm/staging/jontsch/wp-content/plugins/advanced-custom-fields-taxonomy-field-add-on/taxonomy-field.php on line 513

Running versions:
WP 3.5
ACF 3.5.6.3
ACF Taxonomy Field add-on 1.4

Same Issue. Anyone found a workaround/solution?

WordPress: 3.4.2
ACF: Version 3.5.5. Also tested on latest version(3.5.7.2)
ACF Taxonomy add-on version 1.4

Anyone? Same problem…

Where is the developer for this plugin? Don’t leave us hanging! Please fix your plugin!