To manually reenable the port that is in err-disable state, simply issue "shutdown" then "no shutdown" on that port. However, the reason that cause err-disabled port is quite complicated. The following page may provide some help.
What is the config on the other side of the link. Check the logs and it will list to the cause for error disable. Most common in this case would be configration mismatch in terms of speed/duples, PAGP config.
Please paste the config og the other side.
Please follow the link paste by above poster for troubleshoot and recover the links.
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