ESX Backup Error for SBE2012

Hi,

I'm Shahrizwan. Need an assist. I'm noticed that my scheduler backups are not running because the current job that runnig is still backup my ESX even the backup's job take time almost 19 hours. It seems that not look normal.

So i decide to remove the ESX and add back the ESX to my backup job. Unfortunately, an error pop up when i'm trying to add the ESX. Please refer the image for the details. Please someone advise me on how to add back the ESX without error. Thanks in advance.