thank you for the error message, now we can start to search for the problems. Most of them are warnings, means it is not really a problem, normally such kind of information / warnings are disabled by server settings, especially on working websites, because those error messages can cause other problems. For example this one:
“Warning: Cannot modify header information – headers already sent by …”
This message is only because of the first error message, would the server don’t output the warning above, it would working without any problem. That’s why on our server it’s working and we don’t see the error messages.
Give us some hours to fix all warnings, then we can upload the update.