Unable to download NAT policy for ACE

(config)#access-list InsideNoNAT_ACL permit 10.0.0.0 255.0.0.0 172.31.3.0 255.255.255.0

Unable to download NAT policy for ACE
All this error message is saying is that the new line in the access-list was not added to the active NAT table, but was added to the access-list. Upon doing some searching, I read in several places that a reboot fixed the problem. While this is true, it is not necessary. All that needs to be done is to remove and reapply the nat statement.

(config)#no nat (inside) 0 access-list InsideNoNAT_ACL
(config)#nat (inside) 0 access-list InsideNoNAT_ACL

This rebuilds the NAT rules and applies all rules in the ACL. Much better than a reload!