What a pathetic response.
your carelessness prevents the actual debugging of other unrelated modules by spewing these warning (triggering failures of header setting instructions)
perhaps this section
[woocommerce-custom-tabs-pro.php@line 58]
$version = $this_version;
$plugin_name = $this_plugin_name;
should have been written as
if(isset($this_version)){
$version = $this_version;
}
if(isset($plugin_name)){
$plugin_name = $this_plugin_name;
}