TDO Mini Forms Error

Anyone know how I can solve the following errors in for TDO Mini Forms?

Error: Got a 0 error when checking …./wp-content/plugins/tdo-mini-forms/tdomf-form-post.php! This will prevent posts from being submitted. The permissions may be wrong on the tdo-mini-forms folder.
Error: Got a 0 error when checking …./wp-content/plugins/tdo-mini-forms/tdomf-form-ajax.php! This will prevent forms that use AJAX from submitting posts. The permissions may be wrong on the tdo-mini-forms folder.
Error: Got a 0 error when checking …./wp-content/plugins/tdo-mini-forms/tdomf-style-form.css! This will make your forms, by default, look very ugly. The permissions may be wrong on the tdo-mini-forms folder.

I’ve tried setting files to different permissions but still receive the same errors.

Thanks