I've already run update functions () on this node, and replication seems 
to be working, so why am I getting these in my log?

2009-12-17 19:12:37 EST ERROR  Slony-I schema version is 
1.2.18                                                                                  
 
2009-12-17 19:12:37 EST ERROR  please upgrade Slony-I schema to version 
1.2.20                                                                    
2009-12-17 19:12:37 EST ERROR  Slony-I module version is 
1.2.18                                                                                  
 
2009-12-17 19:12:37 EST ERROR  please upgrade Slony-I shared module to 
version 1.2.20