error modifying an LTM pool

tmsh modify cli admin-partition all-partitions mypartition

 

 

tmsh modify ltm pool WEBPOOL members replace-all-with { 10.2.11.160:80 { state up } }

 

01020036:3: The requested monitor_instance (WEB-80 10.2.11.172 http 2) was not found.

 

 

I was able to go into the GUI and add the new server, and remove the old server while still using monitor WEB-80.

 

 

anyone else run into this?