You will have to ask your server. I believe it is a PHP setting that prevent the script to be run several times during a small amount of time. Another solution is to use lm/html/upload_list.php on your server.
Hi stanbusk thank you very much for your suggest.
I have tried to contact web hosting and then I adjust the .htaccess to achieve the lm.php request. but it is still appear the error and also stopped at 1001 Recipients when I upload to MLM.
Then I upload the file from upload_list.php but it is stopped too.
How can I run this software to support my large database well?