Problems and workarounds using v. 1.1 on wordpress 3.4.2

problem 1
I received the following warning after installing the plugin on wordpress 3.4.2 running the v. 1.6 of the skeleton theme:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘jmm_joinsite’ not found or invalid function name in /f5/kma/public/wp-includes/plugin.php on line 403

I found a workaround by changing the following line in admin/defines.php from:
if ($jmm_options['type'] == 1) { add_action('init', 'jmm_joinsite'); }
to:
if ($jmm_options['type'] == 1) { add_action('init', array('JMM','join_site')); }

problem 2
I got the following errors when trying to make a new signup page with the shortcode:

Notice: Undefined variable: blog_id in /f5/kma/public/wp-content/plugins/join-my-multisite/lib/signuppage.php on line 90

Notice: Trying to get property of non-object in /f5/kma/public/wp-content/plugins/join-my-multisite/lib/signuppage.php on line 94

I fixed this by changing line 90 on lib/signuppage.php from:
$blog_details = get_blog_details($blog_id);
to:
$blog_details = get_blog_details($current_site->blog_id);

problem 3
I could now make a signup page and it loaded correctly but I was getting an undefined $goto variable error. I found a workaround by moving the section of code near the beginning of signuppage.php that sets $goto and putting in the signup_user function.

function signup_user($user_name = '', $user_email = '', $errors = '') {
        global $current_site, $active_signup;

$jmm_options = get_option( 'helfjmm_options' );
    if ( !is_null($jmm_options['perpage']) && $jmm_options['perpage'] != "XXXXXX"  )
        {$goto = get_permalink($jmm_options['perpage']); }
    else
        {$goto = '/wp-signup.php';}
...

These are just workarounds I found by following the error messages. I am not that familiar with php or the wordpress codebase, so this was simply my attempt to get things working. It is not meant to be pretty, but maybe it could be of help to someone else.

https://www.ads-software.com/extend/plugins/join-my-multisite/